diff --git a/dev/search-index.js b/dev/search-index.js
index 3498b4848..02f4a765b 100644
--- a/dev/search-index.js
+++ b/dev/search-index.js
@@ -104,9 +104,9 @@ var searchIndex = JSON.parse('{\
 "uu_basenc":{"doc":"","t":[5,5],"n":["uu_app","uumain"],"q":["uu_basenc",""],"d":["",""],"i":[0,0],"f":[[[],["app",3]],[[],["i32",15]]],"p":[]},\
 "uu_cat":{"doc":"","t":[5,5],"n":["uu_app","uumain"],"q":["uu_cat",""],"d":["",""],"i":[0,0],"f":[[[],["app",3]],[[],["i32",15]]],"p":[]},\
 "uu_chcon":{"doc":"","t":[0,5,5,7,7,7,7,7,7,7,0,0,0,7,7,7,7,7,7,7],"n":["options","uu_app","uumain","RANGE","RECURSIVE","REFERENCE","ROLE","TYPE","USER","VERBOSE","dereference","preserve_root","sym_links","DEREFERENCE","NO_DEREFERENCE","NO_PRESERVE_ROOT","PRESERVE_ROOT","FOLLOW_ARG_DIR_SYM_LINK","FOLLOW_DIR_SYM_LINKS","NO_FOLLOW_SYM_LINKS"],"q":["uu_chcon","","","uu_chcon::options","","","","","","","","","","uu_chcon::options::dereference","","uu_chcon::options::preserve_root","","uu_chcon::options::sym_links","",""],"d":["","","","","","","","","","","","","","","","","","","",""],"i":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"f":[null,[[],["app",3]],[[],["i32",15]],null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"p":[]},\
-"uu_chgrp":{"doc":"","t":[0,5,5,3,8,3,11,11,11,11,11,11,11,11,11,11,11,11,11,5,5,12,12,5,5,11,11,10,11,11,11,11,12,12,11,11,11,11,11,11,11,11,12,5,12,12,12,12,5],"n":["entries","uu_app","uumain","Group","Locate","Passwd","belongs_to","borrow","borrow","borrow_mut","borrow_mut","clone","clone","clone_into","clone_into","fmt","fmt","from","from","get_groups","get_groups_gnu","gid","gid","gid2grp","grp2gid","into","into","locate","locate","locate","locate","locate","name","name","to_owned","to_owned","try_from","try_from","try_into","try_into","type_id","type_id","uid","uid2usr","user_dir","user_info","user_passwd","user_shell","usr2uid"],"q":["uu_chgrp","","","uu_chgrp::entries","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","",""],"d":["Get password/group file entry","","","","Fetch desired entry.","","This is a wrapper function for <code>libc::getgrouplist</code>.","","","","","","","","","","","","","From: …","The list of group IDs returned from GNU’s <code>groups</code> and GNU…","AKA passwd.pw_gid","AKA group.gr_gid","","","","","","","","","","AKA passwd.pw_name","AKA group.gr_name","","","","","","","","","AKA passwd.pw_uid","","AKA passwd.pw_dir","AKA passwd.pw_gecos","AKA passwd.pw_passwd","AKA passwd.pw_shell",""],"i":[0,0,0,0,0,0,1,1,2,1,2,1,2,1,2,1,2,1,2,0,0,1,2,0,0,1,2,3,1,1,2,2,1,2,1,2,1,2,1,2,1,2,1,0,1,1,1,1,0],"f":[null,[[],["app",3]],[[],["i32",15]],null,null,null,[[],["vec",3,[["u32",15],["global",3]]]],[[]],[[]],[[]],[[]],[[],["passwd",3]],[[],["group",3]],[[]],[[]],[[["formatter",3]],["result",4,[["error",3]]]],[[["formatter",3]],["result",4,[["error",3]]]],[[]],[[]],[[],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],[[["option",4,[["u32",15]]]],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],null,null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],[[["str",15]],["result",4,[["u32",15],["error",3]]]],[[]],[[]],[[],["result",4,[["error",3]]]],[[["str",15]],["result",4,[["passwd",3],["error",3]]]],[[["u32",15]],["result",4,[["passwd",3],["error",3]]]],[[["str",15]],["result",4,[["group",3],["error",3]]]],[[["u32",15]],["result",4,[["group",3],["error",3]]]],null,null,[[]],[[]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["typeid",3]],[[],["typeid",3]],null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],null,null,null,null,[[["str",15]],["result",4,[["u32",15],["error",3]]]]],"p":[[3,"Passwd"],[3,"Group"],[8,"Locate"]]},\
+"uu_chgrp":{"doc":"","t":[0,5,5,3,8,3,11,11,11,11,11,11,11,11,11,11,11,11,11,5,5,12,12,5,5,11,11,10,11,11,11,11,12,12,11,11,11,11,11,11,11,11,12,5,12,12,12,12,5],"n":["entries","uu_app","uumain","Group","Locate","Passwd","belongs_to","borrow","borrow","borrow_mut","borrow_mut","clone","clone","clone_into","clone_into","fmt","fmt","from","from","get_groups","get_groups_gnu","gid","gid","gid2grp","grp2gid","into","into","locate","locate","locate","locate","locate","name","name","to_owned","to_owned","try_from","try_from","try_into","try_into","type_id","type_id","uid","uid2usr","user_dir","user_info","user_passwd","user_shell","usr2uid"],"q":["uu_chgrp","","","uu_chgrp::entries","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","",""],"d":["Get password/group file entry","","","","Fetch desired entry.","","This is a wrapper function for <code>libc::getgrouplist</code>.","","","","","","","","","","","","","From: …","The list of group IDs returned from GNU’s <code>groups</code> and GNU…","AKA passwd.pw_gid","AKA group.gr_gid","","","","","","","","","","AKA passwd.pw_name","AKA group.gr_name","","","","","","","","","AKA passwd.pw_uid","","AKA passwd.pw_dir","AKA passwd.pw_gecos","AKA passwd.pw_passwd","AKA passwd.pw_shell",""],"i":[0,0,0,0,0,0,1,1,2,1,2,1,2,1,2,1,2,1,2,0,0,1,2,0,0,1,2,3,1,1,2,2,1,2,1,2,1,2,1,2,1,2,1,0,1,1,1,1,0],"f":[null,[[],["app",3]],[[],["i32",15]],null,null,null,[[],["vec",3,[["u32",15],["global",3]]]],[[]],[[]],[[]],[[]],[[],["passwd",3]],[[],["group",3]],[[]],[[]],[[["formatter",3]],["result",4,[["error",3]]]],[[["formatter",3]],["result",4,[["error",3]]]],[[]],[[]],[[],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],[[["option",4,[["u32",15]]]],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],null,null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],[[["str",15]],["result",4,[["u32",15],["error",3]]]],[[]],[[]],[[],["result",4,[["error",3]]]],[[["u32",15]],["result",4,[["passwd",3],["error",3]]]],[[["str",15]],["result",4,[["passwd",3],["error",3]]]],[[["u32",15]],["result",4,[["group",3],["error",3]]]],[[["str",15]],["result",4,[["group",3],["error",3]]]],null,null,[[]],[[]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["typeid",3]],[[],["typeid",3]],null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],null,null,null,null,[[["str",15]],["result",4,[["u32",15],["error",3]]]]],"p":[[3,"Passwd"],[3,"Group"],[8,"Locate"]]},\
 "uu_chmod":{"doc":"","t":[5,5,5],"n":["is_symlink","uu_app","uumain"],"q":["uu_chmod","",""],"d":["","",""],"i":[0,0,0],"f":[[[["asref",8,[["path",3]]]],["bool",15]],[[],["app",3]],[[],["i32",15]]],"p":[]},\
-"uu_chown":{"doc":"","t":[3,8,3,11,11,11,11,11,11,11,11,11,0,11,11,11,11,12,12,11,11,10,11,11,11,11,12,12,11,11,11,11,11,11,11,11,12,12,12,12,12,5,5,3,8,3,5,5,12,12,5,5,10,12,12,12,5,12,12,12,12,5],"n":["Group","Locate","Passwd","belongs_to","borrow","borrow","borrow_mut","borrow_mut","clone","clone","clone_into","clone_into","entries","fmt","fmt","from","from","gid","gid","into","into","locate","locate","locate","locate","locate","name","name","to_owned","to_owned","try_from","try_from","try_into","try_into","type_id","type_id","uid","user_dir","user_info","user_passwd","user_shell","uu_app","uumain","Group","Locate","Passwd","get_groups","get_groups_gnu","gid","gid","gid2grp","grp2gid","locate","name","name","uid","uid2usr","user_dir","user_info","user_passwd","user_shell","usr2uid"],"q":["uu_chown","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","uu_chown::entries","","","","","","","","","","","","","","","","","",""],"d":["","Fetch desired entry.","","This is a wrapper function for <code>libc::getgrouplist</code>.","","","","","","","","","Get password/group file entry","","","","","AKA passwd.pw_gid","AKA group.gr_gid","","","","","","","","AKA passwd.pw_name","AKA group.gr_name","","","","","","","","","AKA passwd.pw_uid","AKA passwd.pw_dir","AKA passwd.pw_gecos","AKA passwd.pw_passwd","AKA passwd.pw_shell","","","","Fetch desired entry.","","From: …","The list of group IDs returned from GNU’s <code>groups</code> and GNU…","AKA passwd.pw_gid","AKA group.gr_gid","","","","AKA passwd.pw_name","AKA group.gr_name","AKA passwd.pw_uid","","AKA passwd.pw_dir","AKA passwd.pw_gecos","AKA passwd.pw_passwd","AKA passwd.pw_shell",""],"i":[0,0,0,1,1,2,1,2,1,2,1,2,0,1,2,1,2,1,2,1,2,3,1,1,2,2,1,2,1,2,1,2,1,2,1,2,1,1,1,1,1,0,0,0,0,0,0,0,1,2,0,0,3,1,2,1,0,1,1,1,1,0],"f":[null,null,null,[[],["vec",3,[["u32",15],["global",3]]]],[[]],[[]],[[]],[[]],[[],["passwd",3]],[[],["group",3]],[[]],[[]],null,[[["formatter",3]],["result",4,[["error",3]]]],[[["formatter",3]],["result",4,[["error",3]]]],[[]],[[]],null,null,[[]],[[]],[[],["result",4,[["error",3]]]],[[["u32",15]],["result",4,[["passwd",3],["error",3]]]],[[["str",15]],["result",4,[["passwd",3],["error",3]]]],[[["u32",15]],["result",4,[["group",3],["error",3]]]],[[["str",15]],["result",4,[["group",3],["error",3]]]],null,null,[[]],[[]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["typeid",3]],[[],["typeid",3]],null,null,null,null,null,[[],["app",3]],[[],["i32",15]],null,null,null,[[],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],[[["option",4,[["u32",15]]]],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],null,null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],[[["str",15]],["result",4,[["u32",15],["error",3]]]],[[],["result",4,[["error",3]]]],null,null,null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],null,null,null,null,[[["str",15]],["result",4,[["u32",15],["error",3]]]]],"p":[[3,"Passwd"],[3,"Group"],[8,"Locate"]]},\
+"uu_chown":{"doc":"","t":[3,8,3,11,11,11,11,11,11,11,11,11,0,11,11,11,11,12,12,11,11,10,11,11,11,11,12,12,11,11,11,11,11,11,11,11,12,12,12,12,12,5,5,3,8,3,5,5,12,12,5,5,10,12,12,12,5,12,12,12,12,5],"n":["Group","Locate","Passwd","belongs_to","borrow","borrow","borrow_mut","borrow_mut","clone","clone","clone_into","clone_into","entries","fmt","fmt","from","from","gid","gid","into","into","locate","locate","locate","locate","locate","name","name","to_owned","to_owned","try_from","try_from","try_into","try_into","type_id","type_id","uid","user_dir","user_info","user_passwd","user_shell","uu_app","uumain","Group","Locate","Passwd","get_groups","get_groups_gnu","gid","gid","gid2grp","grp2gid","locate","name","name","uid","uid2usr","user_dir","user_info","user_passwd","user_shell","usr2uid"],"q":["uu_chown","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","","uu_chown::entries","","","","","","","","","","","","","","","","","",""],"d":["","Fetch desired entry.","","This is a wrapper function for <code>libc::getgrouplist</code>.","","","","","","","","","Get password/group file entry","","","","","AKA passwd.pw_gid","AKA group.gr_gid","","","","","","","","AKA passwd.pw_name","AKA group.gr_name","","","","","","","","","AKA passwd.pw_uid","AKA passwd.pw_dir","AKA passwd.pw_gecos","AKA passwd.pw_passwd","AKA passwd.pw_shell","","","","Fetch desired entry.","","From: …","The list of group IDs returned from GNU’s <code>groups</code> and GNU…","AKA passwd.pw_gid","AKA group.gr_gid","","","","AKA passwd.pw_name","AKA group.gr_name","AKA passwd.pw_uid","","AKA passwd.pw_dir","AKA passwd.pw_gecos","AKA passwd.pw_passwd","AKA passwd.pw_shell",""],"i":[0,0,0,1,1,2,1,2,1,2,1,2,0,1,2,1,2,1,2,1,2,3,1,1,2,2,1,2,1,2,1,2,1,2,1,2,1,1,1,1,1,0,0,0,0,0,0,0,1,2,0,0,3,1,2,1,0,1,1,1,1,0],"f":[null,null,null,[[],["vec",3,[["u32",15],["global",3]]]],[[]],[[]],[[]],[[]],[[],["passwd",3]],[[],["group",3]],[[]],[[]],null,[[["formatter",3]],["result",4,[["error",3]]]],[[["formatter",3]],["result",4,[["error",3]]]],[[]],[[]],null,null,[[]],[[]],[[],["result",4,[["error",3]]]],[[["str",15]],["result",4,[["passwd",3],["error",3]]]],[[["u32",15]],["result",4,[["passwd",3],["error",3]]]],[[["u32",15]],["result",4,[["group",3],["error",3]]]],[[["str",15]],["result",4,[["group",3],["error",3]]]],null,null,[[]],[[]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["result",4]],[[],["typeid",3]],[[],["typeid",3]],null,null,null,null,null,[[],["app",3]],[[],["i32",15]],null,null,null,[[],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],[[["option",4,[["u32",15]]]],["result",4,[["vec",3,[["u32",15],["global",3]]],["error",3]]]],null,null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],[[["str",15]],["result",4,[["u32",15],["error",3]]]],[[],["result",4,[["error",3]]]],null,null,null,[[["u32",15]],["result",4,[["string",3],["error",3]]]],null,null,null,null,[[["str",15]],["result",4,[["u32",15],["error",3]]]]],"p":[[3,"Passwd"],[3,"Group"],[8,"Locate"]]},\
 "uu_chroot":{"doc":"","t":[5,5],"n":["uu_app","uumain"],"q":["uu_chroot",""],"d":["",""],"i":[0,0],"f":[[[],["app",3]],[[],["i32",15]]],"p":[]},\
 "uu_cksum":{"doc":"","t":[5,5],"n":["uu_app","uumain"],"q":["uu_cksum",""],"d":["",""],"i":[0,0],"f":[[[],["app",3]],[[],["i32",15]]],"p":[]},\
 "uu_comm":{"doc":"","t":[5,5],"n":["uu_app","uumain"],"q":["uu_comm",""],"d":["",""],"i":[0,0],"f":[[[],["app",3]],[[],["i32",15]]],"p":[]},\
@@ -197,7 +197,7 @@ var searchIndex = JSON.parse('{\
 "uu_who":{"doc":"","t":[5,5],"n":["uu_app","uumain"],"q":["uu_who",""],"d":["",""],"i":[0,0],"f":[[[],["app",3]],[[],["i32",15]]],"p":[]},\
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diff --git a/dev/src/uu_dd/parseargs.rs.html b/dev/src/uu_dd/parseargs.rs.html
index a8215f9f0..57ab0c50b 100644
--- a/dev/src/uu_dd/parseargs.rs.html
+++ b/dev/src/uu_dd/parseargs.rs.html
@@ -783,6 +783,14 @@
 <span id="782">782</span>
 <span id="783">783</span>
 <span id="784">784</span>
+<span id="785">785</span>
+<span id="786">786</span>
+<span id="787">787</span>
+<span id="788">788</span>
+<span id="789">789</span>
+<span id="790">790</span>
+<span id="791">791</span>
+<span id="792">792</span>
 </pre><pre class="rust"><code><span class="comment">// This file is part of the uutils coreutils package.</span>
 <span class="comment">//</span>
 <span class="comment">// (c) Tyler Steele &lt;tyler.steele@protonmail.com&gt;</span>
@@ -1110,6 +1118,14 @@
     }
 }
 
+<span class="kw">fn</span> <span class="ident">show_zero_multiplier_warning</span>() {
+    <span class="macro">show_warning!</span>(
+        <span class="string">&quot;{} is a zero multiplier; use {} if that is intended&quot;</span>,
+        <span class="string">&quot;0x&quot;</span>.<span class="ident">quote</span>(),
+        <span class="string">&quot;00x&quot;</span>.<span class="ident">quote</span>()
+    );
+}
+
 <span class="doccomment">/// Parse bytes using str::parse, then map error if needed.</span>
 <span class="kw">fn</span> <span class="ident">parse_bytes_only</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">ParseError</span><span class="op">&gt;</span> {
     <span class="ident">s</span>.<span class="ident">parse</span>()
@@ -1142,13 +1158,6 @@
 <span class="doccomment">/// assert_eq!(parse_bytes_no_x(&quot;2k&quot;).unwrap(), 2 * 1024);</span>
 <span class="doccomment">/// ```</span>
 <span class="kw">fn</span> <span class="ident">parse_bytes_no_x</span>(<span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">ParseError</span><span class="op">&gt;</span> {
-    <span class="kw">if</span> <span class="ident">s</span> <span class="op">==</span> <span class="string">&quot;0&quot;</span> {
-        <span class="macro">show_warning!</span>(
-            <span class="string">&quot;{} is a zero multiplier; use {} if that is intended&quot;</span>,
-            <span class="string">&quot;0x&quot;</span>.<span class="ident">quote</span>(),
-            <span class="string">&quot;00x&quot;</span>.<span class="ident">quote</span>()
-        );
-    }
     <span class="kw">let</span> (<span class="ident">num</span>, <span class="ident">multiplier</span>) <span class="op">=</span> <span class="kw">match</span> (<span class="ident">s</span>.<span class="ident">find</span>(<span class="string">&#39;c&#39;</span>), <span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">&#39;w&#39;</span>), <span class="ident">s</span>.<span class="ident">rfind</span>(<span class="string">&#39;b&#39;</span>)) {
         (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>, <span class="prelude-val">None</span>) =&gt; <span class="kw">match</span> <span class="ident">uucore::parse_size::parse_size</span>(<span class="ident">s</span>) {
             <span class="prelude-val">Ok</span>(<span class="ident">n</span>) =&gt; (<span class="ident">n</span>, <span class="number">1</span>),
@@ -1186,13 +1195,20 @@
 
     <span class="comment">// Split on the &#39;x&#39; characters. Each component will be parsed</span>
     <span class="comment">// individually, then multiplied together.</span>
-    <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total</span> <span class="op">=</span> <span class="number">1</span>;
-    <span class="kw">for</span> <span class="ident">part</span> <span class="kw">in</span> <span class="ident">s</span>.<span class="ident">split</span>(<span class="string">&#39;x&#39;</span>) {
-        <span class="kw">let</span> <span class="ident">num</span> <span class="op">=</span> <span class="ident">parse_bytes_no_x</span>(<span class="ident">part</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">with_arg</span>(<span class="ident">s</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
-        <span class="ident">total</span> <span class="kw-2">*</span><span class="op">=</span> <span class="ident">num</span>;
+    <span class="kw">let</span> <span class="ident">parts</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="kw-2">&amp;</span><span class="ident">str</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">split</span>(<span class="string">&#39;x&#39;</span>).<span class="ident">collect</span>();
+    <span class="kw">if</span> <span class="ident">parts</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">1</span> {
+        <span class="ident">parse_bytes_no_x</span>(<span class="ident">parts</span>[<span class="number">0</span>]).<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">with_arg</span>(<span class="ident">s</span>.<span class="ident">to_string</span>()))
+    } <span class="kw">else</span> {
+        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total</span> <span class="op">=</span> <span class="number">1</span>;
+        <span class="kw">for</span> <span class="ident">part</span> <span class="kw">in</span> <span class="ident">parts</span> {
+            <span class="kw">if</span> <span class="ident">part</span> <span class="op">==</span> <span class="string">&quot;0&quot;</span> {
+                <span class="ident">show_zero_multiplier_warning</span>();
+            }
+            <span class="kw">let</span> <span class="ident">num</span> <span class="op">=</span> <span class="ident">parse_bytes_no_x</span>(<span class="ident">part</span>).<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">e</span><span class="op">|</span> <span class="ident">e</span>.<span class="ident">with_arg</span>(<span class="ident">s</span>.<span class="ident">to_string</span>()))<span class="question-mark">?</span>;
+            <span class="ident">total</span> <span class="kw-2">*</span><span class="op">=</span> <span class="ident">num</span>;
+        }
+        <span class="prelude-val">Ok</span>(<span class="ident">total</span>)
     }
-
-    <span class="prelude-val">Ok</span>(<span class="ident">total</span>)
 }
 
 <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">parse_ibs</span>(<span class="ident">matches</span>: <span class="kw-2">&amp;</span><span class="ident">Matches</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">usize</span>, <span class="ident">ParseError</span><span class="op">&gt;</span> {
diff --git a/dev/src/uu_ls/ls.rs.html b/dev/src/uu_ls/ls.rs.html
index 93ca6782a..f75be6fee 100644
--- a/dev/src/uu_ls/ls.rs.html
+++ b/dev/src/uu_ls/ls.rs.html
@@ -2583,6 +2583,16 @@
 <span id="2582">2582</span>
 <span id="2583">2583</span>
 <span id="2584">2584</span>
+<span id="2585">2585</span>
+<span id="2586">2586</span>
+<span id="2587">2587</span>
+<span id="2588">2588</span>
+<span id="2589">2589</span>
+<span id="2590">2590</span>
+<span id="2591">2591</span>
+<span id="2592">2592</span>
+<span id="2593">2593</span>
+<span id="2594">2594</span>
 </pre><pre class="rust"><code><span class="comment">// This file is part of the uutils coreutils package.</span>
 <span class="comment">//</span>
 <span class="comment">// (c) Jeremiah Peschka &lt;jeremiah.peschka@gmail.com&gt;</span>
@@ -3994,7 +4004,8 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
                 <span class="comment">// if not, check if we can use Path metadata</span>
                 <span class="kw">match</span> <span class="ident">get_metadata</span>(<span class="self">self</span>.<span class="ident">p_buf</span>.<span class="ident">as_path</span>(), <span class="self">self</span>.<span class="ident">must_dereference</span>) {
                     <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
-                        <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">out</span>.<span class="ident">flush</span>();
+                        <span class="comment">// FIXME: A bit tricky to propagate the result here</span>
+                        <span class="ident">out</span>.<span class="ident">flush</span>().<span class="ident">unwrap</span>();
                         <span class="kw">let</span> <span class="ident">errno</span> <span class="op">=</span> <span class="ident">err</span>.<span class="ident">raw_os_error</span>().<span class="ident">unwrap_or</span>(<span class="number">1i32</span>);
                         <span class="comment">// a bad fd will throw an error when dereferenced,</span>
                         <span class="comment">// but GNU will not throw an error until a bad fd &quot;dir&quot;</span>
@@ -4058,7 +4069,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
     <span class="ident">sort_entries</span>(<span class="kw-2">&amp;mut</span> <span class="ident">files</span>, <span class="ident">config</span>, <span class="kw-2">&amp;mut</span> <span class="ident">out</span>);
     <span class="ident">sort_entries</span>(<span class="kw-2">&amp;mut</span> <span class="ident">dirs</span>, <span class="ident">config</span>, <span class="kw-2">&amp;mut</span> <span class="ident">out</span>);
 
-    <span class="ident">display_items</span>(<span class="kw-2">&amp;</span><span class="ident">files</span>, <span class="ident">config</span>, <span class="kw-2">&amp;mut</span> <span class="ident">out</span>);
+    <span class="ident">display_items</span>(<span class="kw-2">&amp;</span><span class="ident">files</span>, <span class="ident">config</span>, <span class="kw-2">&amp;mut</span> <span class="ident">out</span>)<span class="question-mark">?</span>;
 
     <span class="kw">for</span> (<span class="ident">pos</span>, <span class="ident">path_data</span>) <span class="kw">in</span> <span class="ident">dirs</span>.<span class="ident">iter</span>().<span class="ident">enumerate</span>() {
         <span class="comment">// Do read_dir call here to match GNU semantics by printing</span>
@@ -4066,7 +4077,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
         <span class="kw">let</span> <span class="ident">read_dir</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">fs::read_dir</span>(<span class="kw-2">&amp;</span><span class="ident">path_data</span>.<span class="ident">p_buf</span>) {
             <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
                 <span class="comment">// flush stdout buffer before the error to preserve formatting and order</span>
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">out</span>.<span class="ident">flush</span>();
+                <span class="ident">out</span>.<span class="ident">flush</span>()<span class="question-mark">?</span>;
                 <span class="macro">show!</span>(<span class="ident">LsError::IOErrorContext</span>(<span class="ident">err</span>, <span class="ident">path_data</span>.<span class="ident">p_buf</span>.<span class="ident">clone</span>()));
                 <span class="kw">continue</span>;
             }
@@ -4076,12 +4087,12 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
         <span class="comment">// Print dir heading - name... &#39;total&#39; comes after error display</span>
         <span class="kw">if</span> <span class="ident">initial_locs_len</span> <span class="op">&gt;</span> <span class="number">1</span> <span class="op">|</span><span class="op">|</span> <span class="ident">config</span>.<span class="ident">recursive</span> {
             <span class="kw">if</span> <span class="ident">pos</span>.<span class="ident">eq</span>(<span class="kw-2">&amp;</span><span class="number">0usize</span>) <span class="op">&amp;&amp;</span> <span class="ident">files</span>.<span class="ident">is_empty</span>() {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;{}:&quot;</span>, <span class="ident">path_data</span>.<span class="ident">p_buf</span>.<span class="ident">display</span>());
+                <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;{}:&quot;</span>, <span class="ident">path_data</span>.<span class="ident">p_buf</span>.<span class="ident">display</span>())<span class="question-mark">?</span>;
             } <span class="kw">else</span> {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;\n{}:&quot;</span>, <span class="ident">path_data</span>.<span class="ident">p_buf</span>.<span class="ident">display</span>());
+                <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;\n{}:&quot;</span>, <span class="ident">path_data</span>.<span class="ident">p_buf</span>.<span class="ident">display</span>())<span class="question-mark">?</span>;
             }
         }
-        <span class="ident">enter_directory</span>(<span class="ident">path_data</span>, <span class="ident">read_dir</span>, <span class="ident">config</span>, <span class="kw-2">&amp;mut</span> <span class="ident">out</span>);
+        <span class="ident">enter_directory</span>(<span class="ident">path_data</span>, <span class="ident">read_dir</span>, <span class="ident">config</span>, <span class="kw-2">&amp;mut</span> <span class="ident">out</span>)<span class="question-mark">?</span>;
     }
 
     <span class="prelude-val">Ok</span>(())
@@ -4155,7 +4166,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
     <span class="ident">read_dir</span>: <span class="ident">ReadDir</span>,
     <span class="ident">config</span>: <span class="kw-2">&amp;</span><span class="ident">Config</span>,
     <span class="ident">out</span>: <span class="kw-2">&amp;mut</span> <span class="ident">BufWriter</span><span class="op">&lt;</span><span class="ident">Stdout</span><span class="op">&gt;</span>,
-) {
+) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
     <span class="comment">// Create vec of entries with initial dot files</span>
     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">entries</span>: <span class="ident">Vec</span><span class="op">&lt;</span><span class="ident">PathData</span><span class="op">&gt;</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">files</span> <span class="op">==</span> <span class="ident">Files::All</span> {
         <span class="macro">vec!</span>[
@@ -4185,7 +4196,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
         <span class="kw">let</span> <span class="ident">dir_entry</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">raw_entry</span> {
             <span class="prelude-val">Ok</span>(<span class="ident">path</span>) =&gt; <span class="ident">path</span>,
             <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">out</span>.<span class="ident">flush</span>();
+                <span class="ident">out</span>.<span class="ident">flush</span>()<span class="question-mark">?</span>;
                 <span class="macro">show!</span>(<span class="ident">LsError::IOError</span>(<span class="ident">err</span>));
                 <span class="kw">continue</span>;
             }
@@ -4203,10 +4214,10 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
 
     <span class="comment">// Print total after any error display</span>
     <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">format</span> <span class="op">==</span> <span class="ident">Format::Long</span> {
-        <span class="ident">display_total</span>(<span class="kw-2">&amp;</span><span class="ident">entries</span>, <span class="ident">config</span>, <span class="ident">out</span>);
+        <span class="ident">display_total</span>(<span class="kw-2">&amp;</span><span class="ident">entries</span>, <span class="ident">config</span>, <span class="ident">out</span>)<span class="question-mark">?</span>;
     }
 
-    <span class="ident">display_items</span>(<span class="kw-2">&amp;</span><span class="ident">entries</span>, <span class="ident">config</span>, <span class="ident">out</span>);
+    <span class="ident">display_items</span>(<span class="kw-2">&amp;</span><span class="ident">entries</span>, <span class="ident">config</span>, <span class="ident">out</span>)<span class="question-mark">?</span>;
 
     <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">recursive</span> {
         <span class="kw">for</span> <span class="ident">e</span> <span class="kw">in</span> <span class="ident">entries</span>
@@ -4218,17 +4229,19 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
         {
             <span class="kw">match</span> <span class="ident">fs::read_dir</span>(<span class="kw-2">&amp;</span><span class="ident">e</span>.<span class="ident">p_buf</span>) {
                 <span class="prelude-val">Err</span>(<span class="ident">err</span>) =&gt; {
-                    <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">out</span>.<span class="ident">flush</span>();
+                    <span class="ident">out</span>.<span class="ident">flush</span>()<span class="question-mark">?</span>;
                     <span class="macro">show!</span>(<span class="ident">LsError::IOErrorContext</span>(<span class="ident">err</span>, <span class="ident">e</span>.<span class="ident">p_buf</span>.<span class="ident">clone</span>()));
                     <span class="kw">continue</span>;
                 }
                 <span class="prelude-val">Ok</span>(<span class="ident">rd</span>) =&gt; {
-                    <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;\n{}:&quot;</span>, <span class="ident">e</span>.<span class="ident">p_buf</span>.<span class="ident">display</span>());
-                    <span class="ident">enter_directory</span>(<span class="ident">e</span>, <span class="ident">rd</span>, <span class="ident">config</span>, <span class="ident">out</span>);
+                    <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;\n{}:&quot;</span>, <span class="ident">e</span>.<span class="ident">p_buf</span>.<span class="ident">display</span>())<span class="question-mark">?</span>;
+                    <span class="ident">enter_directory</span>(<span class="ident">e</span>, <span class="ident">rd</span>, <span class="ident">config</span>, <span class="ident">out</span>)<span class="question-mark">?</span>;
                 }
             }
         }
     }
+
+    <span class="prelude-val">Ok</span>(())
 }
 
 <span class="kw">fn</span> <span class="ident">get_metadata</span>(<span class="ident">p_buf</span>: <span class="kw-2">&amp;</span><span class="ident">Path</span>, <span class="ident">dereference</span>: <span class="ident">bool</span>) -&gt; <span class="ident">std::io::Result</span><span class="op">&lt;</span><span class="ident">Metadata</span><span class="op">&gt;</span> {
@@ -4276,7 +4289,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
     <span class="macro">format!</span>(<span class="string">&quot;{:&lt;width$}&quot;</span>, <span class="ident">string</span>, <span class="ident">width</span> <span class="op">=</span> <span class="ident">count</span>)
 }
 
-<span class="kw">fn</span> <span class="ident">display_total</span>(<span class="ident">items</span>: <span class="kw-2">&amp;</span>[<span class="ident">PathData</span>], <span class="ident">config</span>: <span class="kw-2">&amp;</span><span class="ident">Config</span>, <span class="ident">out</span>: <span class="kw-2">&amp;mut</span> <span class="ident">BufWriter</span><span class="op">&lt;</span><span class="ident">Stdout</span><span class="op">&gt;</span>) {
+<span class="kw">fn</span> <span class="ident">display_total</span>(<span class="ident">items</span>: <span class="kw-2">&amp;</span>[<span class="ident">PathData</span>], <span class="ident">config</span>: <span class="kw-2">&amp;</span><span class="ident">Config</span>, <span class="ident">out</span>: <span class="kw-2">&amp;mut</span> <span class="ident">BufWriter</span><span class="op">&lt;</span><span class="ident">Stdout</span><span class="op">&gt;</span>) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
     <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">total_size</span> <span class="op">=</span> <span class="number">0</span>;
     <span class="kw">for</span> <span class="ident">item</span> <span class="kw">in</span> <span class="ident">items</span> {
         <span class="ident">total_size</span> <span class="op">+</span><span class="op">=</span> <span class="ident">item</span>
@@ -4284,10 +4297,11 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
             .<span class="ident">as_ref</span>()
             .<span class="ident">map_or</span>(<span class="number">0</span>, <span class="op">|</span><span class="ident">md</span><span class="op">|</span> <span class="ident">get_block_size</span>(<span class="ident">md</span>, <span class="ident">config</span>));
     }
-    <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;total {}&quot;</span>, <span class="ident">display_size</span>(<span class="ident">total_size</span>, <span class="ident">config</span>));
+    <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;total {}&quot;</span>, <span class="ident">display_size</span>(<span class="ident">total_size</span>, <span class="ident">config</span>))<span class="question-mark">?</span>;
+    <span class="prelude-val">Ok</span>(())
 }
 
-<span class="kw">fn</span> <span class="ident">display_items</span>(<span class="ident">items</span>: <span class="kw-2">&amp;</span>[<span class="ident">PathData</span>], <span class="ident">config</span>: <span class="kw-2">&amp;</span><span class="ident">Config</span>, <span class="ident">out</span>: <span class="kw-2">&amp;mut</span> <span class="ident">BufWriter</span><span class="op">&lt;</span><span class="ident">Stdout</span><span class="op">&gt;</span>) {
+<span class="kw">fn</span> <span class="ident">display_items</span>(<span class="ident">items</span>: <span class="kw-2">&amp;</span>[<span class="ident">PathData</span>], <span class="ident">config</span>: <span class="kw-2">&amp;</span><span class="ident">Config</span>, <span class="ident">out</span>: <span class="kw-2">&amp;mut</span> <span class="ident">BufWriter</span><span class="op">&lt;</span><span class="ident">Stdout</span><span class="op">&gt;</span>) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
     <span class="comment">// `-Z`, `--context`:</span>
     <span class="comment">// Display the SELinux security context or &#39;?&#39; if none is found. When used with the `-l`</span>
     <span class="comment">// option, print the security context to the left of the size column.</span>
@@ -4296,7 +4310,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
         <span class="kw">let</span> <span class="ident">padding_collection</span> <span class="op">=</span> <span class="ident">calculate_padding_collection</span>(<span class="ident">items</span>, <span class="ident">config</span>, <span class="ident">out</span>);
 
         <span class="kw">for</span> <span class="ident">item</span> <span class="kw">in</span> <span class="ident">items</span> {
-            <span class="ident">display_item_long</span>(<span class="ident">item</span>, <span class="kw-2">&amp;</span><span class="ident">padding_collection</span>, <span class="ident">config</span>, <span class="ident">out</span>);
+            <span class="ident">display_item_long</span>(<span class="ident">item</span>, <span class="kw-2">&amp;</span><span class="ident">padding_collection</span>, <span class="ident">config</span>, <span class="ident">out</span>)<span class="question-mark">?</span>;
         }
     } <span class="kw">else</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">longest_context_len</span> <span class="op">=</span> <span class="number">1</span>;
@@ -4333,13 +4347,13 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
             .<span class="ident">into_iter</span>();
 
         <span class="kw">match</span> <span class="ident">config</span>.<span class="ident">format</span> {
-            <span class="ident">Format::Columns</span> =&gt; <span class="ident">display_grid</span>(<span class="ident">names</span>, <span class="ident">config</span>.<span class="ident">width</span>, <span class="ident">Direction::TopToBottom</span>, <span class="ident">out</span>),
-            <span class="ident">Format::Across</span> =&gt; <span class="ident">display_grid</span>(<span class="ident">names</span>, <span class="ident">config</span>.<span class="ident">width</span>, <span class="ident">Direction::LeftToRight</span>, <span class="ident">out</span>),
+            <span class="ident">Format::Columns</span> =&gt; <span class="ident">display_grid</span>(<span class="ident">names</span>, <span class="ident">config</span>.<span class="ident">width</span>, <span class="ident">Direction::TopToBottom</span>, <span class="ident">out</span>)<span class="question-mark">?</span>,
+            <span class="ident">Format::Across</span> =&gt; <span class="ident">display_grid</span>(<span class="ident">names</span>, <span class="ident">config</span>.<span class="ident">width</span>, <span class="ident">Direction::LeftToRight</span>, <span class="ident">out</span>)<span class="question-mark">?</span>,
             <span class="ident">Format::Commas</span> =&gt; {
                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">current_col</span> <span class="op">=</span> <span class="number">0</span>;
                 <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">names</span> <span class="op">=</span> <span class="ident">names</span>;
                 <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">name</span>) <span class="op">=</span> <span class="ident">names</span>.<span class="ident">next</span>() {
-                    <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>);
+                    <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>)<span class="question-mark">?</span>;
                     <span class="ident">current_col</span> <span class="op">=</span> <span class="ident">name</span>.<span class="ident">width</span> <span class="kw">as</span> <span class="ident">u16</span> <span class="op">+</span> <span class="number">2</span>;
                 }
                 <span class="kw">for</span> <span class="ident">name</span> <span class="kw">in</span> <span class="ident">names</span> {
@@ -4347,25 +4361,27 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
                     <span class="comment">// If the width is 0 we print one single line</span>
                     <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">width</span> <span class="op">!</span><span class="op">=</span> <span class="number">0</span> <span class="op">&amp;&amp;</span> <span class="ident">current_col</span> <span class="op">+</span> <span class="ident">name_width</span> <span class="op">+</span> <span class="number">1</span> <span class="op">&gt;</span> <span class="ident">config</span>.<span class="ident">width</span> {
                         <span class="ident">current_col</span> <span class="op">=</span> <span class="ident">name_width</span> <span class="op">+</span> <span class="number">2</span>;
-                        <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;,\n{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>);
+                        <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;,\n{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>)<span class="question-mark">?</span>;
                     } <span class="kw">else</span> {
                         <span class="ident">current_col</span> <span class="op">+</span><span class="op">=</span> <span class="ident">name_width</span> <span class="op">+</span> <span class="number">2</span>;
-                        <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;, {}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>);
+                        <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;, {}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>)<span class="question-mark">?</span>;
                     }
                 }
                 <span class="comment">// Current col is never zero again if names have been printed.</span>
                 <span class="comment">// So we print a newline.</span>
                 <span class="kw">if</span> <span class="ident">current_col</span> <span class="op">&gt;</span> <span class="number">0</span> {
-                    <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>,);
+                    <span class="macro">writeln!</span>(<span class="ident">out</span>,)<span class="question-mark">?</span>;
                 }
             }
             <span class="kw">_</span> =&gt; {
                 <span class="kw">for</span> <span class="ident">name</span> <span class="kw">in</span> <span class="ident">names</span> {
-                    <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>);
+                    <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>)<span class="question-mark">?</span>;
                 }
             }
-        }
+        };
     }
+
+    <span class="prelude-val">Ok</span>(())
 }
 
 <span class="kw">fn</span> <span class="ident">get_block_size</span>(<span class="ident">md</span>: <span class="kw-2">&amp;</span><span class="ident">Metadata</span>, <span class="ident">config</span>: <span class="kw-2">&amp;</span><span class="ident">Config</span>) -&gt; <span class="ident">u64</span> {
@@ -4384,6 +4400,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
 
     <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">unix</span>))]</span>
     {
+        <span class="comment">// Silence linter warning about `config` being unused for windows.</span>
         <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">config</span>;
         <span class="comment">// no way to get block size for windows, fall-back to file size</span>
         <span class="ident">md</span>.<span class="ident">len</span>()
@@ -4395,19 +4412,19 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
     <span class="ident">width</span>: <span class="ident">u16</span>,
     <span class="ident">direction</span>: <span class="ident">Direction</span>,
     <span class="ident">out</span>: <span class="kw-2">&amp;mut</span> <span class="ident">BufWriter</span><span class="op">&lt;</span><span class="ident">Stdout</span><span class="op">&gt;</span>,
-) {
+) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
     <span class="kw">if</span> <span class="ident">width</span> <span class="op">==</span> <span class="number">0</span> {
         <span class="comment">// If the width is 0 we print one single line</span>
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">printed_something</span> <span class="op">=</span> <span class="bool-val">false</span>;
         <span class="kw">for</span> <span class="ident">name</span> <span class="kw">in</span> <span class="ident">names</span> {
             <span class="kw">if</span> <span class="ident">printed_something</span> {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;  &quot;</span>);
+                <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;  &quot;</span>)<span class="question-mark">?</span>;
             }
             <span class="ident">printed_something</span> <span class="op">=</span> <span class="bool-val">true</span>;
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>);
+            <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">name</span>.<span class="ident">contents</span>)<span class="question-mark">?</span>;
         }
         <span class="kw">if</span> <span class="ident">printed_something</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>);
+            <span class="macro">writeln!</span>(<span class="ident">out</span>)<span class="question-mark">?</span>;
         }
     } <span class="kw">else</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">grid</span> <span class="op">=</span> <span class="ident">Grid::new</span>(<span class="ident">GridOptions</span> {
@@ -4421,14 +4438,15 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
 
         <span class="kw">match</span> <span class="ident">grid</span>.<span class="ident">fit_into_width</span>(<span class="ident">width</span> <span class="kw">as</span> <span class="ident">usize</span>) {
             <span class="prelude-val">Some</span>(<span class="ident">output</span>) =&gt; {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">output</span>);
+                <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">output</span>)<span class="question-mark">?</span>;
             }
             <span class="comment">// Width is too small for the grid, so we fit it in one column</span>
             <span class="prelude-val">None</span> =&gt; {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">grid</span>.<span class="ident">fit_into_columns</span>(<span class="number">1</span>));
+                <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{}&quot;</span>, <span class="ident">grid</span>.<span class="ident">fit_into_columns</span>(<span class="number">1</span>))<span class="question-mark">?</span>;
             }
         }
     }
+    <span class="prelude-val">Ok</span>(())
 }
 
 <span class="doccomment">/// This writes to the BufWriter out a single string of the output of `ls -l`.</span>
@@ -4464,16 +4482,16 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
     <span class="ident">padding</span>: <span class="kw-2">&amp;</span><span class="ident">PaddingCollection</span>,
     <span class="ident">config</span>: <span class="kw-2">&amp;</span><span class="ident">Config</span>,
     <span class="ident">out</span>: <span class="kw-2">&amp;mut</span> <span class="ident">BufWriter</span><span class="op">&lt;</span><span class="ident">Stdout</span><span class="op">&gt;</span>,
-) {
+) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
     <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">md</span>) <span class="op">=</span> <span class="ident">item</span>.<span class="ident">md</span>(<span class="ident">out</span>) {
         <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
         {
             <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">inode</span> {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{} &quot;</span>, <span class="ident">pad_left</span>(<span class="kw-2">&amp;</span><span class="ident">get_inode</span>(<span class="ident">md</span>), <span class="ident">padding</span>.<span class="ident">inode</span>),);
+                <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{} &quot;</span>, <span class="ident">pad_left</span>(<span class="kw-2">&amp;</span><span class="ident">get_inode</span>(<span class="ident">md</span>), <span class="ident">padding</span>.<span class="ident">inode</span>))<span class="question-mark">?</span>;
             }
         }
 
-        <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+        <span class="macro">write!</span>(
             <span class="ident">out</span>,
             <span class="string">&quot;{}{} {}&quot;</span>,
             <span class="ident">display_permissions</span>(<span class="ident">md</span>, <span class="bool-val">true</span>),
@@ -4484,49 +4502,49 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
             } <span class="kw">else</span> {
                 <span class="string">&quot;&quot;</span>
             },
-            <span class="ident">pad_left</span>(<span class="kw-2">&amp;</span><span class="ident">display_symlink_count</span>(<span class="ident">md</span>), <span class="ident">padding</span>.<span class="ident">link_count</span>),
-        );
+            <span class="ident">pad_left</span>(<span class="kw-2">&amp;</span><span class="ident">display_symlink_count</span>(<span class="ident">md</span>), <span class="ident">padding</span>.<span class="ident">link_count</span>)
+        )<span class="question-mark">?</span>;
 
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">long</span>.<span class="ident">owner</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+            <span class="macro">write!</span>(
                 <span class="ident">out</span>,
                 <span class="string">&quot; {}&quot;</span>,
-                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">display_uname</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">padding</span>.<span class="ident">uname</span>),
-            );
+                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">display_uname</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">padding</span>.<span class="ident">uname</span>)
+            )<span class="question-mark">?</span>;
         }
 
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">long</span>.<span class="ident">group</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+            <span class="macro">write!</span>(
                 <span class="ident">out</span>,
                 <span class="string">&quot; {}&quot;</span>,
-                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">display_group</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">padding</span>.<span class="ident">group</span>),
-            );
+                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">display_group</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">padding</span>.<span class="ident">group</span>)
+            )<span class="question-mark">?</span>;
         }
 
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">context</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+            <span class="macro">write!</span>(
                 <span class="ident">out</span>,
                 <span class="string">&quot; {}&quot;</span>,
-                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">item</span>.<span class="ident">security_context</span>, <span class="ident">padding</span>.<span class="ident">context</span>),
-            );
+                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">item</span>.<span class="ident">security_context</span>, <span class="ident">padding</span>.<span class="ident">context</span>)
+            )<span class="question-mark">?</span>;
         }
 
         <span class="comment">// Author is only different from owner on GNU/Hurd, so we reuse</span>
         <span class="comment">// the owner, since GNU/Hurd is not currently supported by Rust.</span>
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">long</span>.<span class="ident">author</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+            <span class="macro">write!</span>(
                 <span class="ident">out</span>,
                 <span class="string">&quot; {}&quot;</span>,
-                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">display_uname</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">padding</span>.<span class="ident">uname</span>),
-            );
+                <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">display_uname</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">padding</span>.<span class="ident">uname</span>)
+            )<span class="question-mark">?</span>;
         }
 
         <span class="kw">match</span> <span class="ident">display_size_or_rdev</span>(<span class="ident">md</span>, <span class="ident">config</span>) {
             <span class="ident">SizeOrDeviceId::Size</span>(<span class="ident">size</span>) =&gt; {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_left</span>(<span class="kw-2">&amp;</span><span class="ident">size</span>, <span class="ident">padding</span>.<span class="ident">size</span>),);
+                <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_left</span>(<span class="kw-2">&amp;</span><span class="ident">size</span>, <span class="ident">padding</span>.<span class="ident">size</span>))<span class="question-mark">?</span>;
             }
             <span class="ident">SizeOrDeviceId::Device</span>(<span class="ident">major</span>, <span class="ident">minor</span>) =&gt; {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+                <span class="macro">write!</span>(
                     <span class="ident">out</span>,
                     <span class="string">&quot; {}, {}&quot;</span>,
                     <span class="ident">pad_left</span>(
@@ -4547,19 +4565,19 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
                         <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
                         <span class="ident">padding</span>.<span class="ident">minor</span>,
                     ),
-                );
+                )<span class="question-mark">?</span>;
             }
         };
 
         <span class="kw">let</span> <span class="ident">dfn</span> <span class="op">=</span> <span class="ident">display_file_name</span>(<span class="ident">item</span>, <span class="ident">config</span>, <span class="prelude-val">None</span>, <span class="number">0</span>, <span class="ident">out</span>).<span class="ident">contents</span>;
 
-        <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot; {} {}&quot;</span>, <span class="ident">display_date</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">dfn</span>);
+        <span class="macro">writeln!</span>(<span class="ident">out</span>, <span class="string">&quot; {} {}&quot;</span>, <span class="ident">display_date</span>(<span class="ident">md</span>, <span class="ident">config</span>), <span class="ident">dfn</span>)<span class="question-mark">?</span>;
     } <span class="kw">else</span> {
         <span class="comment">// this &#39;else&#39; is expressly for the case of a dangling symlink/restricted file</span>
         <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
         {
             <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">inode</span> {
-                <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{} &quot;</span>, <span class="ident">pad_left</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">inode</span>),);
+                <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot;{} &quot;</span>, <span class="ident">pad_left</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">inode</span>))<span class="question-mark">?</span>;
             }
         }
 
@@ -4596,7 +4614,7 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
             }
         };
 
-        <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+        <span class="macro">write!</span>(
             <span class="ident">out</span>,
             <span class="string">&quot;{}{} {}&quot;</span>,
             <span class="macro">format_args!</span>(<span class="string">&quot;{}?????????&quot;</span>, <span class="ident">leading_char</span>),
@@ -4607,42 +4625,44 @@ only ignore &#39;.&#39; and &#39;..&#39;.&quot;</span>,
             } <span class="kw">else</span> {
                 <span class="string">&quot;&quot;</span>
             },
-            <span class="ident">pad_left</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">link_count</span>),
-        );
+            <span class="ident">pad_left</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">link_count</span>)
+        )<span class="question-mark">?</span>;
 
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">long</span>.<span class="ident">owner</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_right</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">uname</span>));
+            <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_right</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">uname</span>))<span class="question-mark">?</span>;
         }
 
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">long</span>.<span class="ident">group</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_right</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">group</span>));
+            <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_right</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">group</span>))<span class="question-mark">?</span>;
         }
 
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">context</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(
+            <span class="macro">write!</span>(
                 <span class="ident">out</span>,
                 <span class="string">&quot; {}&quot;</span>,
                 <span class="ident">pad_right</span>(<span class="kw-2">&amp;</span><span class="ident">item</span>.<span class="ident">security_context</span>, <span class="ident">padding</span>.<span class="ident">context</span>)
-            );
+            )<span class="question-mark">?</span>;
         }
 
         <span class="comment">// Author is only different from owner on GNU/Hurd, so we reuse</span>
         <span class="comment">// the owner, since GNU/Hurd is not currently supported by Rust.</span>
         <span class="kw">if</span> <span class="ident">config</span>.<span class="ident">long</span>.<span class="ident">author</span> {
-            <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_right</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">uname</span>));
+            <span class="macro">write!</span>(<span class="ident">out</span>, <span class="string">&quot; {}&quot;</span>, <span class="ident">pad_right</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">uname</span>))<span class="question-mark">?</span>;
         }
 
         <span class="kw">let</span> <span class="ident">dfn</span> <span class="op">=</span> <span class="ident">display_file_name</span>(<span class="ident">item</span>, <span class="ident">config</span>, <span class="prelude-val">None</span>, <span class="number">0</span>, <span class="ident">out</span>).<span class="ident">contents</span>;
         <span class="kw">let</span> <span class="ident">date_len</span> <span class="op">=</span> <span class="number">12</span>;
 
-        <span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="macro">writeln!</span>(
+        <span class="macro">writeln!</span>(
             <span class="ident">out</span>,
             <span class="string">&quot; {} {} {}&quot;</span>,
             <span class="ident">pad_left</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">padding</span>.<span class="ident">size</span>),
             <span class="ident">pad_left</span>(<span class="string">&quot;?&quot;</span>, <span class="ident">date_len</span>),
             <span class="ident">dfn</span>,
-        );
+        )<span class="question-mark">?</span>;
     }
+
+    <span class="prelude-val">Ok</span>(())
 }
 
 <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">unix</span>)]</span>
diff --git a/dev/src/uu_printf/printf.rs.html b/dev/src/uu_printf/printf.rs.html
index 6ee163c61..77b51f343 100644
--- a/dev/src/uu_printf/printf.rs.html
+++ b/dev/src/uu_printf/printf.rs.html
@@ -591,7 +591,7 @@ COPYRIGHT :
         <span class="prelude-val">None</span> =&gt; <span class="macro">vec!</span>[],
     };
 
-    <span class="ident">memo::Memo::run_all</span>(<span class="ident">format_string</span>, <span class="kw-2">&amp;</span><span class="ident">values</span>[..]);
+    <span class="ident">memo::Memo::run_all</span>(<span class="ident">format_string</span>, <span class="kw-2">&amp;</span><span class="ident">values</span>[..])<span class="question-mark">?</span>;
     <span class="prelude-val">Ok</span>(())
 }
 
diff --git a/dev/src/uu_seq/seq.rs.html b/dev/src/uu_seq/seq.rs.html
index a66edec01..7ec2cfd8c 100644
--- a/dev/src/uu_seq/seq.rs.html
+++ b/dev/src/uu_seq/seq.rs.html
@@ -364,6 +364,14 @@
 <span id="363">363</span>
 <span id="364">364</span>
 <span id="365">365</span>
+<span id="366">366</span>
+<span id="367">367</span>
+<span id="368">368</span>
+<span id="369">369</span>
+<span id="370">370</span>
+<span id="371">371</span>
+<span id="372">372</span>
+<span id="373">373</span>
 </pre><pre class="rust"><code><span class="comment">//  * This file is part of the uutils coreutils package.</span>
 <span class="comment">//  *</span>
 <span class="comment">//  * For the full copyright and license information, please view the LICENSE</span>
@@ -371,6 +379,7 @@
 <span class="comment">// TODO: Support -f flag</span>
 <span class="comment">// spell-checker:ignore (ToDO) istr chiter argptr ilen extendedbigdecimal extendedbigint numberparse</span>
 <span class="kw">use</span> <span class="ident">std::io</span>::{<span class="ident">stdout</span>, <span class="ident">ErrorKind</span>, <span class="ident">Write</span>};
+<span class="kw">use</span> <span class="ident">std::process::exit</span>;
 
 <span class="kw">use</span> <span class="ident">clap</span>::{<span class="ident">crate_version</span>, <span class="ident">App</span>, <span class="ident">AppSettings</span>, <span class="ident">Arg</span>};
 <span class="kw">use</span> <span class="ident">num_traits::Zero</span>;
@@ -378,6 +387,7 @@
 <span class="kw">use</span> <span class="ident">uucore::error::FromIo</span>;
 <span class="kw">use</span> <span class="ident">uucore::error::UResult</span>;
 <span class="kw">use</span> <span class="ident">uucore::memo::Memo</span>;
+<span class="kw">use</span> <span class="ident">uucore::show</span>;
 
 <span class="kw">mod</span> <span class="ident">error</span>;
 <span class="kw">mod</span> <span class="ident">extendedbigdecimal</span>;
@@ -653,7 +663,10 @@
         <span class="kw">match</span> <span class="ident">format</span> {
             <span class="prelude-val">Some</span>(<span class="ident">f</span>) =&gt; {
                 <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">value</span>);
-                <span class="ident">Memo::run_all</span>(<span class="ident">f</span>, <span class="kw-2">&amp;</span>[<span class="ident">s</span>]);
+                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">Memo::run_all</span>(<span class="ident">f</span>, <span class="kw-2">&amp;</span>[<span class="ident">s</span>]) {
+                    <span class="macro">show!</span>(<span class="ident">x</span>);
+                    <span class="ident">exit</span>(<span class="number">1</span>);
+                }
             }
             <span class="prelude-val">None</span> =&gt; <span class="ident">write_value_float</span>(
                 <span class="kw-2">&amp;mut</span> <span class="ident">stdout</span>,
@@ -715,7 +728,10 @@
         <span class="kw">match</span> <span class="ident">format</span> {
             <span class="prelude-val">Some</span>(<span class="ident">f</span>) =&gt; {
                 <span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="macro">format!</span>(<span class="string">&quot;{}&quot;</span>, <span class="ident">value</span>);
-                <span class="ident">Memo::run_all</span>(<span class="ident">f</span>, <span class="kw-2">&amp;</span>[<span class="ident">s</span>]);
+                <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Err</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">Memo::run_all</span>(<span class="ident">f</span>, <span class="kw-2">&amp;</span>[<span class="ident">s</span>]) {
+                    <span class="macro">show!</span>(<span class="ident">x</span>);
+                    <span class="ident">exit</span>(<span class="number">1</span>);
+                }
             }
             <span class="prelude-val">None</span> =&gt; <span class="ident">write_value_int</span>(<span class="kw-2">&amp;mut</span> <span class="ident">stdout</span>, <span class="kw-2">&amp;</span><span class="ident">value</span>, <span class="ident">padding</span>, <span class="ident">pad</span>, <span class="ident">is_first_iteration</span>)<span class="question-mark">?</span>,
         }
diff --git a/dev/src/uucore/features/memo.rs.html b/dev/src/uucore/features/memo.rs.html
index bbbe06464..d8b75e898 100644
--- a/dev/src/uucore/features/memo.rs.html
+++ b/dev/src/uucore/features/memo.rs.html
@@ -83,6 +83,7 @@
 <span id="82">82</span>
 <span id="83">83</span>
 <span id="84">84</span>
+<span id="85">85</span>
 </pre><pre class="rust"><code><span class="doccomment">//! Memo runner of printf</span>
 <span class="doccomment">//! Takes a format string and arguments</span>
 <span class="doccomment">//! 1. tokenize format string into tokens, consuming</span>
@@ -91,6 +92,7 @@
 <span class="doccomment">//! that prints tokens.</span>
 
 <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::display::Quotable</span>;
+<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error::UResult</span>;
 <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::features::tokenize::sub::Sub</span>;
 <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::features::tokenize::token</span>::{<span class="ident">Token</span>, <span class="ident">Tokenizer</span>};
 <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::features::tokenize::unescaped_text::UnescapedText</span>;
@@ -111,17 +113,17 @@
 }
 
 <span class="kw">impl</span> <span class="ident">Memo</span> {
-    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">pf_string</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">pf_args_it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Peekable</span><span class="op">&lt;</span><span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>) -&gt; <span class="self">Self</span> {
+    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">pf_string</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">pf_args_it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Peekable</span><span class="op">&lt;</span><span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span><span class="self">Self</span><span class="op">&gt;</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">pm</span> <span class="op">=</span> <span class="self">Self</span> { <span class="ident">tokens</span>: <span class="ident">Vec::new</span>() };
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">tmp_token</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Token</span><span class="op">&gt;</span><span class="op">&gt;</span>;
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> <span class="ident">put_back_n</span>(<span class="ident">pf_string</span>.<span class="ident">chars</span>());
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">has_sub</span> <span class="op">=</span> <span class="bool-val">false</span>;
         <span class="kw">loop</span> {
-            <span class="ident">tmp_token</span> <span class="op">=</span> <span class="ident">UnescapedText::from_it</span>(<span class="kw-2">&amp;mut</span> <span class="ident">it</span>, <span class="ident">pf_args_it</span>);
+            <span class="ident">tmp_token</span> <span class="op">=</span> <span class="ident">UnescapedText::from_it</span>(<span class="kw-2">&amp;mut</span> <span class="ident">it</span>, <span class="ident">pf_args_it</span>)<span class="question-mark">?</span>;
             <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">tmp_token</span> {
                 <span class="ident">pm</span>.<span class="ident">tokens</span>.<span class="ident">push</span>(<span class="ident">x</span>);
             }
-            <span class="ident">tmp_token</span> <span class="op">=</span> <span class="ident">Sub::from_it</span>(<span class="kw-2">&amp;mut</span> <span class="ident">it</span>, <span class="ident">pf_args_it</span>);
+            <span class="ident">tmp_token</span> <span class="op">=</span> <span class="ident">Sub::from_it</span>(<span class="kw-2">&amp;mut</span> <span class="ident">it</span>, <span class="ident">pf_args_it</span>)<span class="question-mark">?</span>;
             <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">tmp_token</span> {
                 <span class="kw">if</span> <span class="op">!</span><span class="ident">has_sub</span> {
                     <span class="ident">has_sub</span> <span class="op">=</span> <span class="bool-val">true</span>;
@@ -149,19 +151,19 @@
                 }
             }
         }
-        <span class="ident">pm</span>
+        <span class="prelude-val">Ok</span>(<span class="ident">pm</span>)
     }
     <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">apply</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">pf_args_it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Peekable</span><span class="op">&lt;</span><span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>) {
         <span class="kw">for</span> <span class="ident">tkn</span> <span class="kw">in</span> <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">tokens</span> {
             <span class="ident">tkn</span>.<span class="ident">print</span>(<span class="ident">pf_args_it</span>);
         }
     }
-    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">run_all</span>(<span class="ident">pf_string</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">pf_args</span>: <span class="kw-2">&amp;</span>[<span class="ident">String</span>]) {
+    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">run_all</span>(<span class="ident">pf_string</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>, <span class="ident">pf_args</span>: <span class="kw-2">&amp;</span>[<span class="ident">String</span>]) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">arg_it</span> <span class="op">=</span> <span class="ident">pf_args</span>.<span class="ident">iter</span>().<span class="ident">peekable</span>();
-        <span class="kw">let</span> <span class="ident">pm</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::new</span>(<span class="ident">pf_string</span>, <span class="kw-2">&amp;mut</span> <span class="ident">arg_it</span>);
+        <span class="kw">let</span> <span class="ident">pm</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::new</span>(<span class="ident">pf_string</span>, <span class="kw-2">&amp;mut</span> <span class="ident">arg_it</span>)<span class="question-mark">?</span>;
         <span class="kw">loop</span> {
             <span class="kw">if</span> <span class="ident">arg_it</span>.<span class="ident">peek</span>().<span class="ident">is_none</span>() {
-                <span class="kw">break</span>;
+                <span class="kw">return</span> <span class="prelude-val">Ok</span>(());
             }
             <span class="ident">pm</span>.<span class="ident">apply</span>(<span class="kw-2">&amp;mut</span> <span class="ident">arg_it</span>);
         }
diff --git a/dev/src/uucore/features/tokenize/sub.rs.html b/dev/src/uucore/features/tokenize/sub.rs.html
index b952b0174..a2def47fc 100644
--- a/dev/src/uucore/features/tokenize/sub.rs.html
+++ b/dev/src/uucore/features/tokenize/sub.rs.html
@@ -420,6 +420,30 @@
 <span id="419">419</span>
 <span id="420">420</span>
 <span id="421">421</span>
+<span id="422">422</span>
+<span id="423">423</span>
+<span id="424">424</span>
+<span id="425">425</span>
+<span id="426">426</span>
+<span id="427">427</span>
+<span id="428">428</span>
+<span id="429">429</span>
+<span id="430">430</span>
+<span id="431">431</span>
+<span id="432">432</span>
+<span id="433">433</span>
+<span id="434">434</span>
+<span id="435">435</span>
+<span id="436">436</span>
+<span id="437">437</span>
+<span id="438">438</span>
+<span id="439">439</span>
+<span id="440">440</span>
+<span id="441">441</span>
+<span id="442">442</span>
+<span id="443">443</span>
+<span id="444">444</span>
+<span id="445">445</span>
 </pre><pre class="rust"><code><span class="comment">// spell-checker:ignore (vars) charf decf floatf intf scif strf Cninety</span>
 
 <span class="doccomment">//! Sub is a token that represents a</span>
@@ -427,8 +451,10 @@
 <span class="doccomment">//! it is created by Sub&#39;s implementation of the Tokenizer trait</span>
 <span class="doccomment">//! Subs which have numeric field chars make use of the num_format</span>
 <span class="doccomment">//! submodule</span>
-<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::show_error</span>;
+<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error</span>::{<span class="ident">UError</span>, <span class="ident">UResult</span>};
 <span class="kw">use</span> <span class="ident">itertools</span>::{<span class="ident">put_back_n</span>, <span class="ident">PutBackN</span>};
+<span class="kw">use</span> <span class="ident">std::error::Error</span>;
+<span class="kw">use</span> <span class="ident">std::fmt::Display</span>;
 <span class="kw">use</span> <span class="ident">std::iter::Peekable</span>;
 <span class="kw">use</span> <span class="ident">std::process::exit</span>;
 <span class="kw">use</span> <span class="ident">std::slice::Iter</span>;
@@ -442,11 +468,23 @@
 
 <span class="kw">const</span> <span class="ident">EXIT_ERR</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="number">1</span>;
 
-<span class="kw">fn</span> <span class="ident">err_conv</span>(<span class="ident">sofar</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) {
-    <span class="macro">show_error!</span>(<span class="string">&quot;%{}: invalid conversion specification&quot;</span>, <span class="ident">sofar</span>);
-    <span class="ident">exit</span>(<span class="ident">EXIT_ERR</span>);
+<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
+<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">SubError</span> {
+    <span class="ident">InvalidSpec</span>(<span class="ident">String</span>),
 }
 
+<span class="kw">impl</span> <span class="ident">Display</span> <span class="kw">for</span> <span class="ident">SubError</span> {
+    <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;mut</span> <span class="ident">std::fmt::Formatter</span><span class="op">&lt;</span><span class="lifetime">&#39;_</span><span class="op">&gt;</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span>(), <span class="ident">std::fmt::Error</span><span class="op">&gt;</span> {
+        <span class="kw">match</span> <span class="self">self</span> {
+            <span class="ident"><span class="self">Self</span>::InvalidSpec</span>(<span class="ident">s</span>) =&gt; <span class="macro">write!</span>(<span class="ident">f</span>, <span class="string">&quot;%{}: invalid conversion specification&quot;</span>, <span class="ident">s</span>),
+        }
+    }
+}
+
+<span class="kw">impl</span> <span class="ident">Error</span> <span class="kw">for</span> <span class="ident">SubError</span> {}
+
+<span class="kw">impl</span> <span class="ident">UError</span> <span class="kw">for</span> <span class="ident">SubError</span> {}
+
 <span class="kw">fn</span> <span class="ident">convert_asterisk_arg_int</span>(<span class="ident">asterisk_arg</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) -&gt; <span class="ident">isize</span> {
     <span class="comment">// this is a costly way to parse the</span>
     <span class="comment">// args used for asterisk values into integers</span>
@@ -538,14 +576,14 @@
     <span class="kw">fn</span> <span class="ident">from_it</span>(
         <span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>,
         <span class="ident">args</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Peekable</span><span class="op">&lt;</span><span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>,
-    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span><span class="op">&gt;</span> {
+    ) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span> {
         <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">parser</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::new</span>();
-        <span class="kw">if</span> <span class="ident">parser</span>.<span class="ident">sub_vals_retrieved</span>(<span class="ident">it</span>) {
+        <span class="kw">if</span> <span class="ident">parser</span>.<span class="ident">sub_vals_retrieved</span>(<span class="ident">it</span>)<span class="question-mark">?</span> {
             <span class="kw">let</span> <span class="ident">t</span>: <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span> <span class="op">=</span> <span class="ident"><span class="self">Self</span>::build_token</span>(<span class="ident">parser</span>);
             <span class="ident">t</span>.<span class="ident">print</span>(<span class="ident">args</span>);
-            <span class="prelude-val">Some</span>(<span class="ident">t</span>)
+            <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(<span class="ident">t</span>))
         } <span class="kw">else</span> {
-            <span class="prelude-val">None</span>
+            <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
         }
     }
     <span class="kw">fn</span> <span class="ident">build_token</span>(<span class="ident">parser</span>: <span class="self">Self</span>) -&gt; <span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span> {
@@ -573,9 +611,9 @@
         ));
         <span class="ident">t</span>
     }
-    <span class="kw">fn</span> <span class="ident">sub_vals_retrieved</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>) -&gt; <span class="ident">bool</span> {
-        <span class="kw">if</span> <span class="op">!</span><span class="ident"><span class="self">Self</span>::successfully_eat_prefix</span>(<span class="ident">it</span>, <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">text_so_far</span>) {
-            <span class="kw">return</span> <span class="bool-val">false</span>;
+    <span class="kw">fn</span> <span class="ident">sub_vals_retrieved</span>(<span class="kw-2">&amp;mut</span> <span class="self">self</span>, <span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
+        <span class="kw">if</span> <span class="op">!</span><span class="ident"><span class="self">Self</span>::successfully_eat_prefix</span>(<span class="ident">it</span>, <span class="kw-2">&amp;mut</span> <span class="self">self</span>.<span class="ident">text_so_far</span>)<span class="question-mark">?</span> {
+            <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="bool-val">false</span>);
         }
         <span class="comment">// this fn in particular is much longer than it needs to be</span>
         <span class="comment">// .could get a lot</span>
@@ -599,7 +637,7 @@
                 <span class="string">&#39;-&#39;</span> <span class="op">|</span> <span class="string">&#39;*&#39;</span> <span class="op">|</span> <span class="string">&#39;0&#39;</span>..<span class="op">=</span><span class="string">&#39;9&#39;</span> =&gt; {
                     <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">past_decimal</span> {
                         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">min_width_is_asterisk</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">specifiers_found</span> {
-                            <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+                            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>());
                         }
                         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">min_width_tmp</span>.<span class="ident">is_none</span>() {
                             <span class="self">self</span>.<span class="ident">min_width_tmp</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">String::new</span>());
@@ -607,7 +645,9 @@
                         <span class="kw">match</span> <span class="self">self</span>.<span class="ident">min_width_tmp</span>.<span class="ident">as_mut</span>() {
                             <span class="prelude-val">Some</span>(<span class="ident">x</span>) =&gt; {
                                 <span class="kw">if</span> (<span class="ident">ch</span> <span class="op">==</span> <span class="string">&#39;-&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="ident">ch</span> <span class="op">==</span> <span class="string">&#39;*&#39;</span>) <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">x</span>.<span class="ident">is_empty</span>() {
-                                    <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+                                    <span class="kw">return</span> <span class="prelude-val">Err</span>(
+                                        <span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>()
+                                    );
                                 }
                                 <span class="kw">if</span> <span class="ident">ch</span> <span class="op">==</span> <span class="string">&#39;*&#39;</span> {
                                     <span class="self">self</span>.<span class="ident">min_width_is_asterisk</span> <span class="op">=</span> <span class="bool-val">true</span>;
@@ -622,7 +662,7 @@
                         <span class="comment">// second field should never have a</span>
                         <span class="comment">// negative value</span>
                         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">second_field_is_asterisk</span> <span class="op">|</span><span class="op">|</span> <span class="ident">ch</span> <span class="op">==</span> <span class="string">&#39;-&#39;</span> <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">specifiers_found</span> {
-                            <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+                            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>());
                         }
                         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">second_field_tmp</span>.<span class="ident">is_none</span>() {
                             <span class="self">self</span>.<span class="ident">second_field_tmp</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">String::new</span>());
@@ -630,7 +670,9 @@
                         <span class="kw">match</span> <span class="self">self</span>.<span class="ident">second_field_tmp</span>.<span class="ident">as_mut</span>() {
                             <span class="prelude-val">Some</span>(<span class="ident">x</span>) =&gt; {
                                 <span class="kw">if</span> <span class="ident">ch</span> <span class="op">==</span> <span class="string">&#39;*&#39;</span> <span class="op">&amp;&amp;</span> <span class="op">!</span><span class="ident">x</span>.<span class="ident">is_empty</span>() {
-                                    <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+                                    <span class="kw">return</span> <span class="prelude-val">Err</span>(
+                                        <span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>()
+                                    );
                                 }
                                 <span class="kw">if</span> <span class="ident">ch</span> <span class="op">==</span> <span class="string">&#39;*&#39;</span> {
                                     <span class="self">self</span>.<span class="ident">second_field_is_asterisk</span> <span class="op">=</span> <span class="bool-val">true</span>;
@@ -647,7 +689,7 @@
                     <span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">past_decimal</span> {
                         <span class="self">self</span>.<span class="ident">past_decimal</span> <span class="op">=</span> <span class="bool-val">true</span>;
                     } <span class="kw">else</span> {
-                        <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+                        <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>());
                     }
                 }
                 <span class="ident">x</span> <span class="kw">if</span> <span class="ident">legal_fields</span>.<span class="ident">binary_search</span>(<span class="kw-2">&amp;</span><span class="ident">x</span>).<span class="ident">is_ok</span>() =&gt; {
@@ -664,18 +706,18 @@
                     }
                 }
                 <span class="kw">_</span> =&gt; {
-                    <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+                    <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>());
                 }
             }
         }
         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">field_char</span>.<span class="ident">is_none</span>() {
-            <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>());
         }
         <span class="kw">let</span> <span class="ident">field_char_retrieved</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">field_char</span>.<span class="ident">unwrap</span>();
         <span class="kw">if</span> <span class="self">self</span>.<span class="ident">past_decimal</span> <span class="op">&amp;&amp;</span> <span class="self">self</span>.<span class="ident">second_field_tmp</span>.<span class="ident">is_none</span>() {
             <span class="self">self</span>.<span class="ident">second_field_tmp</span> <span class="op">=</span> <span class="prelude-val">Some</span>(<span class="ident">String::from</span>(<span class="string">&quot;0&quot;</span>));
         }
-        <span class="self">self</span>.<span class="ident">validate_field_params</span>(<span class="ident">field_char_retrieved</span>);
+        <span class="self">self</span>.<span class="ident">validate_field_params</span>(<span class="ident">field_char_retrieved</span>)<span class="question-mark">?</span>;
         <span class="comment">// if the dot is provided without a second field</span>
         <span class="comment">// printf interprets it as 0.</span>
         <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="self">self</span>.<span class="ident">second_field_tmp</span>.<span class="ident">as_mut</span>() {
@@ -684,9 +726,12 @@
             }
         }
 
-        <span class="bool-val">true</span>
+        <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>)
     }
-    <span class="kw">fn</span> <span class="ident">successfully_eat_prefix</span>(<span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>, <span class="ident">text_so_far</span>: <span class="kw-2">&amp;mut</span> <span class="ident">String</span>) -&gt; <span class="ident">bool</span> {
+    <span class="kw">fn</span> <span class="ident">successfully_eat_prefix</span>(
+        <span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>,
+        <span class="ident">text_so_far</span>: <span class="kw-2">&amp;mut</span> <span class="ident">String</span>,
+    ) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span> {
         <span class="comment">// get next two chars,</span>
         <span class="comment">// if they&#39;re &#39;%%&#39; we&#39;re not tokenizing it</span>
         <span class="comment">// else put chars back</span>
@@ -696,12 +741,11 @@
             <span class="kw">match</span> <span class="ident">n_ch</span> {
                 <span class="prelude-val">Some</span>(<span class="ident">x</span>) =&gt; {
                     <span class="ident">it</span>.<span class="ident">put_back</span>(<span class="ident">x</span>);
-                    <span class="bool-val">true</span>
+                    <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>)
                 }
                 <span class="prelude-val">None</span> =&gt; {
                     <span class="ident">text_so_far</span>.<span class="ident">push</span>(<span class="string">&#39;%&#39;</span>);
-                    <span class="ident">err_conv</span>(<span class="ident">text_so_far</span>);
-                    <span class="bool-val">false</span>
+                    <span class="prelude-val">Err</span>(<span class="ident">SubError::InvalidSpec</span>(<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>())
                 }
             }
         } <span class="kw">else</span> {
@@ -711,10 +755,10 @@
             <span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">x</span>) <span class="op">=</span> <span class="ident">preface</span> {
                 <span class="ident">it</span>.<span class="ident">put_back</span>(<span class="ident">x</span>);
             };
-            <span class="bool-val">false</span>
+            <span class="prelude-val">Ok</span>(<span class="bool-val">false</span>)
         }
     }
-    <span class="kw">fn</span> <span class="ident">validate_field_params</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">field_char</span>: <span class="ident">char</span>) {
+    <span class="kw">fn</span> <span class="ident">validate_field_params</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">field_char</span>: <span class="ident">char</span>) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span>()<span class="op">&gt;</span> {
         <span class="comment">// check for illegal combinations here when possible vs</span>
         <span class="comment">// on each application so we check less per application</span>
         <span class="comment">// to do: move these checks to Sub::new</span>
@@ -726,8 +770,12 @@
                     <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">past_decimal</span>
                     <span class="op">|</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">second_field_tmp</span>.<span class="ident">is_some</span>()))
         {
-            <span class="ident">err_conv</span>(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="ident">text_so_far</span>);
+            <span class="comment">// invalid string substitution</span>
+            <span class="comment">// to do: include information about an invalid</span>
+            <span class="comment">// string substitution</span>
+            <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">SubError::InvalidSpec</span>(<span class="self">self</span>.<span class="ident">text_so_far</span>.<span class="ident">clone</span>()).<span class="ident">into</span>());
         }
+        <span class="prelude-val">Ok</span>(())
     }
 }
 
@@ -735,7 +783,7 @@
     <span class="kw">fn</span> <span class="ident">from_it</span>(
         <span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>,
         <span class="ident">args</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Peekable</span><span class="op">&lt;</span><span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>,
-    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span><span class="op">&gt;</span> {
+    ) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span> {
         <span class="ident">SubParser::from_it</span>(<span class="ident">it</span>, <span class="ident">args</span>)
     }
 }
diff --git a/dev/src/uucore/features/tokenize/token.rs.html b/dev/src/uucore/features/tokenize/token.rs.html
index a2d1bfaf8..1fe70eda2 100644
--- a/dev/src/uucore/features/tokenize/token.rs.html
+++ b/dev/src/uucore/features/tokenize/token.rs.html
@@ -30,12 +30,16 @@
 <span id="29">29</span>
 <span id="30">30</span>
 <span id="31">31</span>
+<span id="32">32</span>
+<span id="33">33</span>
 </pre><pre class="rust"><code><span class="doccomment">//! Traits and enums dealing with Tokenization of printf Format String</span>
 <span class="kw">use</span> <span class="ident">itertools::PutBackN</span>;
 <span class="kw">use</span> <span class="ident">std::iter::Peekable</span>;
 <span class="kw">use</span> <span class="ident">std::slice::Iter</span>;
 <span class="kw">use</span> <span class="ident">std::str::Chars</span>;
 
+<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error::UResult</span>;
+
 <span class="comment">// A token object is an object that can print the expected output</span>
 <span class="comment">// of a contiguous segment of the format string, and</span>
 <span class="comment">// requires at most 1 argument</span>
@@ -59,7 +63,7 @@
     <span class="kw">fn</span> <span class="ident">from_it</span>(
         <span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>,
         <span class="ident">args</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Peekable</span><span class="op">&lt;</span><span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>,
-    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Token</span><span class="op">&gt;</span><span class="op">&gt;</span>;
+    ) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">Token</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span>;
 }
 </code></pre></div>
 </section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="uucore" data-search-index-js="../../../../search-index.js" data-search-js="../../../../search.js"></div>
diff --git a/dev/src/uucore/features/tokenize/unescaped_text.rs.html b/dev/src/uucore/features/tokenize/unescaped_text.rs.html
index d8059d6d7..0a21a137d 100644
--- a/dev/src/uucore/features/tokenize/unescaped_text.rs.html
+++ b/dev/src/uucore/features/tokenize/unescaped_text.rs.html
@@ -276,6 +276,8 @@
 <span id="275">275</span>
 <span id="276">276</span>
 <span id="277">277</span>
+<span id="278">278</span>
+<span id="279">279</span>
 </pre><pre class="rust"><code><span class="doccomment">//! UnescapedText is a tokenizer impl</span>
 <span class="doccomment">//! for tokenizing character literals,</span>
 <span class="doccomment">//! and escaped character literals (of allowed escapes),</span>
@@ -291,6 +293,8 @@
 <span class="kw">use</span> <span class="ident">std::slice::Iter</span>;
 <span class="kw">use</span> <span class="ident">std::str::Chars</span>;
 
+<span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::error::UResult</span>;
+
 <span class="kw">use</span> <span class="ident"><span class="kw">super</span>::token</span>;
 
 <span class="kw">const</span> <span class="ident">EXIT_OK</span>: <span class="ident">i32</span> <span class="op">=</span> <span class="number">0</span>;
@@ -544,8 +548,8 @@
     <span class="kw">fn</span> <span class="ident">from_it</span>(
         <span class="ident">it</span>: <span class="kw-2">&amp;mut</span> <span class="ident">PutBackN</span><span class="op">&lt;</span><span class="ident">Chars</span><span class="op">&gt;</span>,
         <span class="kw">_</span>: <span class="kw-2">&amp;mut</span> <span class="ident">Peekable</span><span class="op">&lt;</span><span class="ident">Iter</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span><span class="op">&gt;</span>,
-    ) -&gt; <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span><span class="op">&gt;</span> {
-        <span class="ident"><span class="self">Self</span>::from_it_core</span>(<span class="ident">it</span>, <span class="bool-val">false</span>)
+    ) -&gt; <span class="ident">UResult</span><span class="op">&lt;</span><span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">Box</span><span class="op">&lt;</span><span class="kw">dyn</span> <span class="ident">token::Token</span><span class="op">&gt;</span><span class="op">&gt;</span><span class="op">&gt;</span> {
+        <span class="prelude-val">Ok</span>(<span class="ident"><span class="self">Self</span>::from_it_core</span>(<span class="ident">it</span>, <span class="bool-val">false</span>))
     }
 }
 <span class="kw">impl</span> <span class="ident">token::Token</span> <span class="kw">for</span> <span class="ident">UnescapedText</span> {
diff --git a/dev/uu_ls/index.html b/dev/uu_ls/index.html
index 8b4cfe69c..6e3421af8 100644
--- a/dev/uu_ls/index.html
+++ b/dev/uu_ls/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `uu_ls` crate."><meta name="keywords" content="rust, rustlang, rust-lang, uu_ls"><title>uu_ls - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
-    <noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../uu_ls/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><h2 class="location">Crate uu_ls</h2><div class="block version"><div class="narrow-helper"></div><p>Version 0.0.12</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all uu_ls's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#functions">Functions</a></li></ul></div><div id="sidebar-vars" data-name="uu_ls" data-ty="mod" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Crate <a class="mod" href="#">uu_ls</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/uu_ls/ls.rs.html#10-2584" title="goto source code">[src]</a></span></h1><h2 id="modules" class="small-section-header"><a href="#modules">Modules</a></h2>
+    <noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../uu_ls/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><h2 class="location">Crate uu_ls</h2><div class="block version"><div class="narrow-helper"></div><p>Version 0.0.12</p></div><div class="sidebar-elems"><a id="all-types" href="all.html"><p>See all uu_ls's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#functions">Functions</a></li></ul></div><div id="sidebar-vars" data-name="uu_ls" data-ty="mod" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Crate <a class="mod" href="#">uu_ls</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/uu_ls/ls.rs.html#10-2594" title="goto source code">[src]</a></span></h1><h2 id="modules" class="small-section-header"><a href="#modules">Modules</a></h2>
 <div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="mod" href="options/index.html" title="uu_ls::options mod">options</a></div><div class="item-right docblock-short"></div></div></div><h2 id="functions" class="small-section-header"><a href="#functions">Functions</a></h2>
 <div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.uu_app.html" title="uu_ls::uu_app fn">uu_app</a></div><div class="item-right docblock-short"></div></div><div class="item-row"><div class="item-left module-item"><a class="fn" href="fn.uumain.html" title="uu_ls::uumain fn">uumain</a></div><div class="item-right docblock-short"></div></div></div></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="uu_ls" data-search-index-js="../search-index.js" data-search-js="../search.js"></div>
 </body></html>
\ No newline at end of file
diff --git a/dev/uu_seq/fn.uu_app.html b/dev/uu_seq/fn.uu_app.html
index 526390392..3f4da1053 100644
--- a/dev/uu_seq/fn.uu_app.html
+++ b/dev/uu_seq/fn.uu_app.html
@@ -1,3 +1,3 @@
 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `uu_app` fn in crate `uu_seq`."><meta name="keywords" content="rust, rustlang, rust-lang, uu_app"><title>uu_app in uu_seq - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
-    <noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../uu_seq/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">uu_seq</a></h2><div id="sidebar-vars" data-name="uu_app" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">uu_seq</a>::<wbr><a class="fn" href="#">uu_app</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/uu_seq/seq.rs.html#146-190" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub fn uu_app&lt;'a&gt;() -&gt; App&lt;'a&gt;</code></pre></div></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="uu_seq" data-search-index-js="../search-index.js" data-search-js="../search.js"></div>
+    <noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../uu_seq/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">uu_seq</a></h2><div id="sidebar-vars" data-name="uu_app" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">uu_seq</a>::<wbr><a class="fn" href="#">uu_app</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/uu_seq/seq.rs.html#148-192" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub fn uu_app&lt;'a&gt;() -&gt; App&lt;'a&gt;</code></pre></div></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="uu_seq" data-search-index-js="../search-index.js" data-search-js="../search.js"></div>
 </body></html>
\ No newline at end of file
diff --git a/dev/uu_seq/fn.uumain.html b/dev/uu_seq/fn.uumain.html
index f9f4bc767..3854fd1a3 100644
--- a/dev/uu_seq/fn.uumain.html
+++ b/dev/uu_seq/fn.uumain.html
@@ -1,3 +1,3 @@
 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `uumain` fn in crate `uu_seq`."><meta name="keywords" content="rust, rustlang, rust-lang, uumain"><title>uumain in uu_seq - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
-    <noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../uu_seq/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">uu_seq</a></h2><div id="sidebar-vars" data-name="uumain" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">uu_seq</a>::<wbr><a class="fn" href="#">uumain</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/uu_seq/seq.rs.html#61" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub fn uumain(args: impl <a class="trait" href="../uucore/trait.Args.html" title="trait uucore::Args">Args</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.i32.html">i32</a></code></pre></div></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="uu_seq" data-search-index-js="../search-index.js" data-search-js="../search.js"></div>
+    <noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.svg"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../uu_seq/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><h2 class="location">Other items in<br><a href="index.html">uu_seq</a></h2><div id="sidebar-vars" data-name="uumain" data-ty="fn" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Function <a href="index.html">uu_seq</a>::<wbr><a class="fn" href="#">uumain</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../src/uu_seq/seq.rs.html#63" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust fn"><code>pub fn uumain(args: impl <a class="trait" href="../uucore/trait.Args.html" title="trait uucore::Args">Args</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.i32.html">i32</a></code></pre></div></section><section id="search" class="content hidden"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="uu_seq" data-search-index-js="../search-index.js" data-search-js="../search.js"></div>
 </body></html>
\ No newline at end of file
diff --git a/dev/uu_seq/index.html b/dev/uu_seq/index.html
index 3ea45e1f9..3f39679e5 100644
--- a/dev/uu_seq/index.html
+++ b/dev/uu_seq/index.html
@@ -1,4 +1,4 @@
 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `uu_seq` crate."><meta name="keywords" content="rust, rustlang, rust-lang, uu_seq"><title>uu_seq - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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diff --git a/dev/uucore/memo/index.html b/dev/uucore/memo/index.html
index 8cd6a8e9a..7f6899d1f 100644
--- a/dev/uucore/memo/index.html
+++ b/dev/uucore/memo/index.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Memo runner of printf Takes a format string and arguments"><meta name="keywords" content="rust, rustlang, rust-lang, memo"><title>uucore::memo - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
-    <noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../uucore/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><h2 class="location">Module memo</h2><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li></ul></div><div id="sidebar-vars" data-name="memo" data-ty="mod" data-relpath="./"></div><script defer src="./sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">uucore</a>::<wbr><a class="mod" href="#">memo</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/uucore/features/memo.rs.html#1-84" title="goto source code">[src]</a></span></h1><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Memo runner of printf
+    <noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../uucore/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><h2 class="location">Module memo</h2><div class="sidebar-elems"><div class="block items"><ul><li><a href="#structs">Structs</a></li></ul></div><div id="sidebar-vars" data-name="memo" data-ty="mod" data-relpath="./"></div><script defer src="./sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Module <a href="../index.html">uucore</a>::<wbr><a class="mod" href="#">memo</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/uucore/features/memo.rs.html#1-85" title="goto source code">[src]</a></span></h1><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Memo runner of printf
 Takes a format string and arguments</p>
 <ol>
 <li>tokenize format string into tokens, consuming
diff --git a/dev/uucore/memo/struct.Memo.html b/dev/uucore/memo/struct.Memo.html
index 44b34fb44..336f2328f 100644
--- a/dev/uucore/memo/struct.Memo.html
+++ b/dev/uucore/memo/struct.Memo.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `Memo` struct in crate `uucore`."><meta name="keywords" content="rust, rustlang, rust-lang, Memo"><title>Memo in uucore::memo - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css"  id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings" ></script><script src="../../storage.js"></script><script src="../../crates.js"></script><script defer src="../../main.js"></script>
-    <noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../uucore/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><h2 class="location">Struct Memo</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#implementations">Methods</a></h3><div class="sidebar-links"><a href="#method.apply">apply</a><a href="#method.new">new</a><a href="#method.run_all">run_all</a></div><h3 class="sidebar-title"><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><div class="sidebar-links"><a href="#impl-RefUnwindSafe">!RefUnwindSafe</a><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">!UnwindSafe</a></div><h3 class="sidebar-title"><a href="#blanket-implementations">Blanket Implementations</a></h3><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow&lt;T&gt;</a><a href="#impl-BorrowMut%3CT%3E">BorrowMut&lt;T&gt;</a><a href="#impl-From%3CT%3E">From&lt;T&gt;</a><a href="#impl-Into%3CU%3E">Into&lt;U&gt;</a><a href="#impl-TryFrom%3CU%3E">TryFrom&lt;U&gt;</a><a href="#impl-TryInto%3CU%3E">TryInto&lt;U&gt;</a></div></div><h2 class="location">Other items in<br><a href="../index.html">uucore</a>::<wbr><a href="index.html">memo</a></h2><div id="sidebar-vars" data-name="Memo" data-ty="struct" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Struct <a href="../index.html">uucore</a>::<wbr><a href="index.html">memo</a>::<wbr><a class="struct" href="#">Memo</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/uucore/features/memo.rs.html#17-19" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust struct"><code>pub struct Memo { /* fields omitted */ }</code></pre></div><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#28-84" title="goto source code">[src]</a></div><a href="#impl" class="anchor"></a><h3 class="code-header in-band">impl <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div></summary><div class="impl-items"><div id="method.new" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#29-68" title="goto source code">[src]</a></div><a href="#method.new" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.new" class="fnname">new</a>(pf_string: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.str.html">str</a>, pf_args_it: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.58.1/core/iter/adapters/peekable/struct.Peekable.html" title="struct core::iter::adapters::peekable::Peekable">Peekable</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.58.1/core/slice/iter/struct.Iter.html" title="struct core::slice::iter::Iter">Iter</a>&lt;'_, <a class="struct" href="https://doc.rust-lang.org/1.58.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;&gt;) -&gt; Self</h4></div><div id="method.apply" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#69-73" title="goto source code">[src]</a></div><a href="#method.apply" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.apply" class="fnname">apply</a>(&amp;self, pf_args_it: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.58.1/core/iter/adapters/peekable/struct.Peekable.html" title="struct core::iter::adapters::peekable::Peekable">Peekable</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.58.1/core/slice/iter/struct.Iter.html" title="struct core::slice::iter::Iter">Iter</a>&lt;'_, <a class="struct" href="https://doc.rust-lang.org/1.58.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;&gt;)</h4></div><div id="method.run_all" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#74-83" title="goto source code">[src]</a></div><a href="#method.run_all" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.run_all" class="fnname">run_all</a>(pf_string: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.str.html">str</a>, pf_args: <a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.slice.html">&amp;[</a><a class="struct" href="https://doc.rust-lang.org/1.58.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a><a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.slice.html">]</a>)</h4></div></div></details><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><div id="impl-RefUnwindSafe" class="impl has-srclink"><div class="rightside"></div><a href="#impl-RefUnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-Send" class="impl has-srclink"><div class="rightside"></div><a href="#impl-Send" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-Sync" class="impl has-srclink"><div class="rightside"></div><a href="#impl-Sync" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-Unpin" class="impl has-srclink"><div class="rightside"></div><a href="#impl-Unpin" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-UnwindSafe" class="impl has-srclink"><div class="rightside"></div><a href="#impl-UnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Any" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/any.rs.html#132-136" title="goto source code">[src]</a></div><a href="#impl-Any" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.58.1/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.type_id" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/any.rs.html#133" title="goto source code">[src]</a></div><a href="#method.type_id" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.58.1/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.58.1/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></div></summary><div class='docblock'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.58.1/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
+    <noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc struct"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">&#9776;</div><a href='../../uucore/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><h2 class="location">Struct Memo</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#implementations">Methods</a></h3><div class="sidebar-links"><a href="#method.apply">apply</a><a href="#method.new">new</a><a href="#method.run_all">run_all</a></div><h3 class="sidebar-title"><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><div class="sidebar-links"><a href="#impl-RefUnwindSafe">!RefUnwindSafe</a><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a><a href="#impl-Unpin">Unpin</a><a href="#impl-UnwindSafe">!UnwindSafe</a></div><h3 class="sidebar-title"><a href="#blanket-implementations">Blanket Implementations</a></h3><div class="sidebar-links"><a href="#impl-Any">Any</a><a href="#impl-Borrow%3CT%3E">Borrow&lt;T&gt;</a><a href="#impl-BorrowMut%3CT%3E">BorrowMut&lt;T&gt;</a><a href="#impl-From%3CT%3E">From&lt;T&gt;</a><a href="#impl-Into%3CU%3E">Into&lt;U&gt;</a><a href="#impl-TryFrom%3CU%3E">TryFrom&lt;U&gt;</a><a href="#impl-TryInto%3CU%3E">TryInto&lt;U&gt;</a></div></div><h2 class="location">Other items in<br><a href="../index.html">uucore</a>::<wbr><a href="index.html">memo</a></h2><div id="sidebar-vars" data-name="Memo" data-ty="struct" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../../brush.svg"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../../wheel.svg"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Struct <a href="../index.html">uucore</a>::<wbr><a href="index.html">memo</a>::<wbr><a class="struct" href="#">Memo</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span><a class="srclink" href="../../src/uucore/features/memo.rs.html#18-20" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust struct"><code>pub struct Memo { /* fields omitted */ }</code></pre></div><h2 id="implementations" class="small-section-header">Implementations<a href="#implementations" class="anchor"></a></h2><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#29-85" title="goto source code">[src]</a></div><a href="#impl" class="anchor"></a><h3 class="code-header in-band">impl <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div></summary><div class="impl-items"><div id="method.new" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#30-69" title="goto source code">[src]</a></div><a href="#method.new" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.new" class="fnname">new</a>(<br>&nbsp;&nbsp;&nbsp;&nbsp;pf_string: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.str.html">str</a>, <br>&nbsp;&nbsp;&nbsp;&nbsp;pf_args_it: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.58.1/core/iter/adapters/peekable/struct.Peekable.html" title="struct core::iter::adapters::peekable::Peekable">Peekable</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.58.1/core/slice/iter/struct.Iter.html" title="struct core::slice::iter::Iter">Iter</a>&lt;'_, <a class="struct" href="https://doc.rust-lang.org/1.58.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;&gt;<br>) -&gt; <a class="type" href="../error/type.UResult.html" title="type uucore::error::UResult">UResult</a>&lt;Self&gt;</h4></div><div id="method.apply" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#70-74" title="goto source code">[src]</a></div><a href="#method.apply" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.apply" class="fnname">apply</a>(&amp;self, pf_args_it: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.58.1/core/iter/adapters/peekable/struct.Peekable.html" title="struct core::iter::adapters::peekable::Peekable">Peekable</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.58.1/core/slice/iter/struct.Iter.html" title="struct core::slice::iter::Iter">Iter</a>&lt;'_, <a class="struct" href="https://doc.rust-lang.org/1.58.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;&gt;)</h4></div><div id="method.run_all" class="method has-srclink"><div class="rightside"><a class="srclink" href="../../src/uucore/features/memo.rs.html#75-84" title="goto source code">[src]</a></div><a href="#method.run_all" class="anchor"></a><h4 class="code-header">pub fn <a href="#method.run_all" class="fnname">run_all</a>(pf_string: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.str.html">str</a>, pf_args: <a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.slice.html">&amp;[</a><a class="struct" href="https://doc.rust-lang.org/1.58.1/alloc/string/struct.String.html" title="struct alloc::string::String">String</a><a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.slice.html">]</a>) -&gt; <a class="type" href="../error/type.UResult.html" title="type uucore::error::UResult">UResult</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.unit.html">()</a>&gt;</h4></div></div></details><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor"></a></h2><div id="synthetic-implementations-list"><div id="impl-RefUnwindSafe" class="impl has-srclink"><div class="rightside"></div><a href="#impl-RefUnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-Send" class="impl has-srclink"><div class="rightside"></div><a href="#impl-Send" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-Sync" class="impl has-srclink"><div class="rightside"></div><a href="#impl-Sync" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-Unpin" class="impl has-srclink"><div class="rightside"></div><a href="#impl-Unpin" class="anchor"></a><h3 class="code-header in-band">impl <a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div><div id="impl-UnwindSafe" class="impl has-srclink"><div class="rightside"></div><a href="#impl-UnwindSafe" class="anchor"></a><h3 class="code-header in-band">impl !<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Memo.html" title="struct uucore::memo::Memo">Memo</a></h3></div></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor"></a></h2><div id="blanket-implementations-list"><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Any" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/any.rs.html#132-136" title="goto source code">[src]</a></div><a href="#impl-Any" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.58.1/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.type_id" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/any.rs.html#133" title="goto source code">[src]</a></div><a href="#method.type_id" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.58.1/core/any/trait.Any.html#tymethod.type_id" class="fnname">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.58.1/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></div></summary><div class='docblock'><p>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.58.1/core/any/trait.Any.html#tymethod.type_id">Read more</a></p>
 </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-Borrow%3CT%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/borrow.rs.html#208-213" title="goto source code">[src]</a></div><a href="#impl-Borrow%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.58.1/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.borrow" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/borrow.rs.html#210" title="goto source code">[src]</a></div><a href="#method.borrow" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.58.1/core/borrow/trait.Borrow.html#tymethod.borrow" class="fnname">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.reference.html">&amp;</a>T</h4></div></summary><div class='docblock'><p>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.58.1/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></p>
 </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-BorrowMut%3CT%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/borrow.rs.html#216-220" title="goto source code">[src]</a></div><a href="#impl-BorrowMut%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.58.1/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;T: ?<a class="trait" href="https://doc.rust-lang.org/1.58.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,&nbsp;</span></h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.borrow_mut" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/borrow.rs.html#217" title="goto source code">[src]</a></div><a href="#method.borrow_mut" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.58.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fnname">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.58.1/std/primitive.reference.html">&amp;mut </a>T</h4></div></summary><div class='docblock'><p>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.58.1/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></p>
 </div></details></div></details><details class="rustdoc-toggle implementors-toggle" open><summary><div id="impl-From%3CT%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/convert/mod.rs.html#549-553" title="goto source code">[src]</a></div><a href="#impl-From%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.58.1/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></div></summary><div class="impl-items"><details class="rustdoc-toggle method-toggle" open><summary><div id="method.from" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="https://doc.rust-lang.org/1.58.1/src/core/convert/mod.rs.html#550" title="goto source code">[src]</a></div><a href="#method.from" class="anchor"></a><h4 class="code-header">pub fn <a href="https://doc.rust-lang.org/1.58.1/core/convert/trait.From.html#tymethod.from" class="fnname">from</a>(t: T) -&gt; T</h4></div></summary><div class='docblock'><p>Performs the conversion.</p>