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[syntax-errors] Named expressions in decorators before Python 3.9 (#16386)

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Summary
--

This PR detects the relaxed grammar for decorators proposed in [PEP
614](https://peps.python.org/pep-0614/) on Python 3.8 and lower.

The 3.8 grammar for decorators is
[here](https://docs.python.org/3.8/reference/compound_stmts.html#grammar-token-decorators):

```
decorators                ::=  decorator+
decorator                 ::=  "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
dotted_name               ::=  identifier ("." identifier)*
```

in contrast to the current grammar
[here](https://docs.python.org/3/reference/compound_stmts.html#grammar-token-python-grammar-decorators)

```
decorators                ::= decorator+
decorator                 ::= "@" assignment_expression NEWLINE
assignment_expression ::= [identifier ":="] expression
```

Test Plan
--

New inline parser tests.
This commit is contained in:
Brent Westbrook 2025-03-05 12:08:18 -05:00 • committed by GitHub
parent d0623888b3
commit 318f503714
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16 changed files with 876 additions and 3 deletions
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2
crates/ruff_python_parser/src/parser/expression.rs
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@ -632,7 +632,7 @@ impl<'src> Parser<'src> {
/// If the parser isn't position at a `(` token.
///
/// See: <https://docs.python.org/3/reference/expressions.html#calls>
fn parse_call_expression(&mut self, func: Expr, start: TextSize) -> ast::ExprCall {
pub(super) fn parse_call_expression(&mut self, func: Expr, start: TextSize) -> ast::ExprCall {
let arguments = self.parse_arguments();
ast::ExprCall {