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[syntax-errors] type alias statements before Python 3.12 (#16478)

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Summary
--
Another simple one, just detect standalone `type` statements. I limited
the diagnostic to `type` itself like [pyright]. That probably makes the
most sense for more complicated examples.

Test Plan
--
Inline tests.

[pyright]:
https://pyright-play.net/?pythonVersion=3.8&strict=true&code=C4TwDgpgBAHlC8UCWA7YQ
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Brent Westbrook 2025-03-04 12:20:10 -05:00 • committed by GitHub
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42
crates/ruff_python_parser/tests/snapshots/invalid_syntax@type_stmt_py311.py.snap Normal file
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@ -0,0 +1,42 @@
---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/err/type_stmt_py311.py
---
## AST
```
Module(
ModModule {
range: 0..57,
body: [
TypeAlias(
StmtTypeAlias {
range: 44..56,
name: Name(
ExprName {
range: 49..50,
id: Name("x"),
ctx: Store,
},
),
type_params: None,
value: Name(
ExprName {
range: 53..56,
id: Name("int"),
ctx: Load,
},
),
},
),
],
},
)
```
## Unsupported Syntax Errors
|
1 | # parse_options: {"target-version": "3.11"}
2 | type x = int
| ^^^^ Syntax Error: Cannot use `type` alias statement on Python 3.11 (syntax was added in Python 3.12)
|

35
crates/ruff_python_parser/tests/snapshots/valid_syntax@type_stmt_py312.py.snap Normal file
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@ -0,0 +1,35 @@
---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/ok/type_stmt_py312.py
---
## AST
```
Module(
ModModule {
range: 0..57,
body: [
TypeAlias(
StmtTypeAlias {
range: 44..56,
name: Name(
ExprName {
range: 49..50,
id: Name("x"),
ctx: Store,
},
),
type_params: None,
value: Name(
ExprName {
range: 53..56,
id: Name("int"),
ctx: Load,
},
),
},
),
],
},
)
```