update error message

Author: ntBre

crates/ruff_python_parser/src/error.rs

@@ -544,9 +544,7 @@ impl Display for UnsupportedSyntaxError {
             UnsupportedSyntaxErrorKind::Match => "Cannot use `match` statement",
             UnsupportedSyntaxErrorKind::Walrus => "Cannot use named assignment expression (`:=`)",
             UnsupportedSyntaxErrorKind::ExceptStar => "Cannot use `except*`",
-            UnsupportedSyntaxErrorKind::RelaxedDecorator => {
-                "Cannot use named expression in decorator"
-            }
+            UnsupportedSyntaxErrorKind::RelaxedDecorator => "Unsupported expression in decorators",
             UnsupportedSyntaxErrorKind::PositionalOnlyParameter => {
                 "Cannot use positional-only parameter separator"
             }

crates/ruff_python_parser/tests/snapshots/invalid_syntax@decorator_expression_py38.py.snap

@@ -96,6 +96,6 @@ Module(
   |
 1 | # parse_options: { "target-version": "3.8" }
 2 | @buttons[0].clicked.connect
-  |  ^^^^^^^^^^^^^^^^^^^^^^^^^^ Syntax Error: Cannot use named expression in decorator on Python 3.8 (syntax was added in Python 3.9)
+  |  ^^^^^^^^^^^^^^^^^^^^^^^^^^ Syntax Error: Unsupported expression in decorators on Python 3.8 (syntax was added in Python 3.9)
 3 | def spam(): ...
   |

crates/ruff_python_parser/tests/snapshots/invalid_syntax@decorator_named_expression_py37.py.snap

@@ -128,6 +128,6 @@ Module(
   |
 1 | # parse_options: { "target-version": "3.7" }
 2 | @(x := lambda x: x)(foo)
-  |  ^^^^^^^^^^^^^^^^^^^^^^^ Syntax Error: Cannot use named expression in decorator on Python 3.7 (syntax was added in Python 3.9)
+  |  ^^^^^^^^^^^^^^^^^^^^^^^ Syntax Error: Unsupported expression in decorators on Python 3.7 (syntax was added in Python 3.9)
 3 | def bar(): ...
   |