tr: enable passing -t multiple times

src/uu/tr/src/tr.rs

@@ -199,7 +199,8 @@ pub fn uu_app() -> Command {
                 .long(options::TRUNCATE_SET1)
                 .short('t')
                 .help("first truncate SET1 to length of SET2")
-                .action(ArgAction::SetTrue),
+                .action(ArgAction::SetTrue)
+                .overrides_with(options::TRUNCATE_SET1),
         )
         .arg(Arg::new(options::SETS).num_args(1..))
 }

tests/by-util/test_tr.rs

@@ -300,7 +300,16 @@ fn test_truncate() {
     new_ucmd!()
         .args(&["-t", "abc", "xy"])
         .pipe_in("abcde")
-        .run()
+        .succeeds()
+        .stdout_is("xycde"); // spell-checker:disable-line
+}
+
+#[test]
+fn test_truncate_multi() {
+    new_ucmd!()
+        .args(&["-tt", "-t", "abc", "xy"])
+        .pipe_in("abcde")
+        .succeeds()
         .stdout_is("xycde"); // spell-checker:disable-line
 }