Trailing comma

RustPython · youknowone · May 19, 2026 · May 19, 2026 · May 19, 2026 · May 19, 2026
commit 97a56598006af0b9ccb41b0c5b0a1c7e5eb45a34
diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
@@ -2001,11 +2001,11 @@
 Traceback (most recent call last):
 SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?
 
->>> from t import x,  # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
+>>> from t import x,
 Traceback (most recent call last):
 SyntaxError: trailing comma not allowed without surrounding parentheses
 
->>> from t import x,y,  # TODO: RUSTPYTHON; Wrong error message # doctest: +EXPECTED_FAILURE
+>>> from t import x,y,
 Traceback (most recent call last):
 SyntaxError: trailing comma not allowed without surrounding parentheses
 

diff --git a/crates/vm/src/vm/vm_new.rs b/crates/vm/src/vm/vm_new.rs
@@ -141,11 +141,17 @@ impl SyntaxErrorInfo {
             }
 
             ParseErrorType::OtherError(s)
-                if s.eq_ignore_ascii_case("Boolean 'not' expression cannot be used here") =>
+                if s.eq_ignore_ascii_case("boolean 'not' expression cannot be used here") =>
             {
                 "'not' after an operator must be parenthesized".into()
             }
 
+            ParseErrorType::OtherError(s)
+                if s.eq_ignore_ascii_case("trailing comma not allowed") =>
+            {
+                "trailing comma not allowed without surrounding parentheses".into()
+            }
+
             _ => {
                 dbg!(error);
                 return;