expr: fix eager evaluation of parenthesized dead branches (#11395)

Co-authored-by: Sylvestre Ledru <sylvestre@debian.org>

src/uu/expr/src/syntax_tree.rs

@@ -624,9 +624,6 @@ pub struct AstNode {
 #[derive(Debug, Clone)]
 #[cfg_attr(test, derive(Eq, PartialEq))]
 pub enum AstNodeInner {
-    Evaluated {
-        value: NumOrStr,
-    },
     Leaf {
         value: MaybeNonUtf8String,
     },
@@ -650,15 +647,6 @@ impl AstNode {
         Parser::new(input).parse()
     }
 
-    pub fn evaluated(self) -> ExprResult<Self> {
-        Ok(Self {
-            id: get_next_id(),
-            inner: AstNodeInner::Evaluated {
-                value: self.eval()?,
-            },
-        })
-    }
-
     pub fn eval(&self) -> ExprResult<NumOrStr> {
         // This function implements a recursive tree-walking algorithm, but uses an explicit
         // stack approach instead of native recursion to avoid potential stack overflow
@@ -669,9 +657,6 @@ impl AstNode {
 
         while let Some(node) = stack.pop() {
             match &node.inner {
-                AstNodeInner::Evaluated { value, .. } => {
-                    result_stack.insert(node.id, Ok(value.clone()));
-                }
                 AstNodeInner::Leaf { value, .. } => {
                     result_stack.insert(node.id, Ok(value.to_owned().into()));
                 }
@@ -896,9 +881,7 @@ impl<'a, S: AsRef<MaybeNonUtf8Str>> Parser<'a, S> {
                 value: self.next()?.into(),
             },
             b"(" => {
-                // Evaluate the node just after parsing to we detect arithmetic
-                // errors before checking for the closing parenthesis.
-                let s = self.parse_expression()?.evaluated()?;
+                let s = self.parse_expression()?;
 
                 match self.next() {
                     Ok(b")") => {}
@@ -1070,9 +1053,7 @@ mod test {
             AstNode::parse(&["(", "1", "+", "2", ")", "*", "3"]),
             Ok(op(
                 BinOp::Numeric(NumericOp::Mul),
-                op(BinOp::Numeric(NumericOp::Add), "1", "2")
-                    .evaluated()
-                    .unwrap(),
+                op(BinOp::Numeric(NumericOp::Add), "1", "2"),
                 "3"
             ))
         );

tests/by-util/test_expr.rs

@@ -217,6 +217,29 @@ fn test_and() {
     new_ucmd!().args(&["", "&", ""]).fails().stdout_only("0\n");
 }
 
+#[test]
+fn test_parenthesized_short_circuit_dead_branches() {
+    new_ucmd!()
+        .args(&["1", "|", "(", "1", "/", "0", ")"])
+        .succeeds()
+        .stdout_only("1\n");
+
+    new_ucmd!()
+        .args(&["0", "&", "(", "1", "/", "0", ")"])
+        .fails_with_code(1)
+        .stdout_only("0\n");
+
+    new_ucmd!()
+        .args(&["1", "|", "(", "0", "&", "(", "1", "/", "0", ")", ")"])
+        .succeeds()
+        .stdout_only("1\n");
+
+    new_ucmd!()
+        .args(&["0", "&", "(", "1", "|", "(", "1", "/", "0", ")", ")"])
+        .fails_with_code(1)
+        .stdout_only("0\n");
+}
+
 #[test]
 fn test_length_fail() {
     new_ucmd!().args(&["length", "αbcdef", "1"]).fails();
@@ -580,11 +603,11 @@ fn test_num_str_comparison() {
 }
 
 #[test]
-fn test_eager_evaluation() {
+fn test_missing_closing_parenthesis_reports_syntax_error() {
     new_ucmd!()
         .args(&["(", "1", "/", "0"])
         .fails()
-        .stderr_contains("division by zero");
+        .stderr_contains("expecting ')' after '0'");
 }
 
 #[test]