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[syntax-errors]: future-feature-not-defined (F407) (#20554)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

This PR implements
https://docs.astral.sh/ruff/rules/future-feature-not-defined/ (F407) as
a semantic syntax error.

## Test Plan

<!-- How was it tested? -->

I have written inline tests as directed in #17412

---------

Signed-off-by: 11happy <soni5happy@gmail.com>
This commit is contained in:
Bhuminjay Soni 2025-09-25 23:22:24 +05:30 • committed by GitHub
parent 6b7a9dc2f2
commit cfc64d1707
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GPG key ID: B5690EEEBB952194
10 changed files with 246 additions and 45 deletions
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3
crates/ruff_python_parser/resources/inline/err/invalid_future_feature.py Normal file
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@ -0,0 +1,3 @@
from __future__ import invalid_feature
from __future__ import annotations, invalid_feature
from __future__ import invalid_feature_1, invalid_feature_2

1
crates/ruff_python_parser/resources/inline/ok/valid_future_feature.py Normal file
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@ -0,0 +1 @@
from __future__ import annotations

46
crates/ruff_python_parser/src/semantic_errors.rs
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@ -65,8 +65,28 @@ impl SemanticSyntaxChecker {
names,
..
}) => {
if self.seen_futures_boundary && matches!(module.as_deref(), Some("__future__")) {
Self::add_error(ctx, SemanticSyntaxErrorKind::LateFutureImport, *range);
if matches!(module.as_deref(), Some("__future__")) {
for name in names {
if !is_known_future_feature(&name.name) {
// test_ok valid_future_feature
// from __future__ import annotations
// test_err invalid_future_feature
// from __future__ import invalid_feature
// from __future__ import annotations, invalid_feature
// from __future__ import invalid_feature_1, invalid_feature_2
Self::add_error(
ctx,
SemanticSyntaxErrorKind::FutureFeatureNotDefined(
name.name.to_string(),
),
name.range,
);
}
}
if self.seen_futures_boundary {
Self::add_error(ctx, SemanticSyntaxErrorKind::LateFutureImport, *range);
}
}
for alias in names {
if alias.name.as_str() == "*" && !ctx.in_module_scope() {
@ -978,6 +998,22 @@ impl SemanticSyntaxChecker {
}
}
fn is_known_future_feature(name: &str) -> bool {
matches!(
name,
"nested_scopes"
| "generators"
| "division"
| "absolute_import"
| "with_statement"
| "print_function"
| "unicode_literals"
| "barry_as_FLUFL"
| "generator_stop"
| "annotations"
)
}
#[derive(Debug, Clone, PartialEq, Eq, Hash, get_size2::GetSize)]
pub struct SemanticSyntaxError {
pub kind: SemanticSyntaxErrorKind,
@ -1086,6 +1122,9 @@ impl Display for SemanticSyntaxError {
SemanticSyntaxErrorKind::MultipleStarredExpressions => {
write!(f, "Two starred expressions in assignment")
}
SemanticSyntaxErrorKind::FutureFeatureNotDefined(name) => {
write!(f, "Future feature `{name}` is not defined")
}
}
}
}
@ -1456,6 +1495,9 @@ pub enum SemanticSyntaxErrorKind {
/// left-hand side of an assignment. Using multiple starred expressions makes
/// the statement invalid and results in a `SyntaxError`.
MultipleStarredExpressions,
/// Represents the use of a `__future__` feature that is not defined.
FutureFeatureNotDefined(String),
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, get_size2::GetSize)]

146
crates/ruff_python_parser/tests/snapshots/invalid_syntax@invalid_future_feature.py.snap Normal file
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@ -0,0 +1,146 @@
---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/err/invalid_future_feature.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..151,
body: [
ImportFrom(
StmtImportFrom {
node_index: NodeIndex(None),
range: 0..38,
module: Some(
Identifier {
id: Name("__future__"),
range: 5..15,
node_index: NodeIndex(None),
},
),
names: [
Alias {
range: 23..38,
node_index: NodeIndex(None),
name: Identifier {
id: Name("invalid_feature"),
range: 23..38,
node_index: NodeIndex(None),
},
asname: None,
},
],
level: 0,
},
),
ImportFrom(
StmtImportFrom {
node_index: NodeIndex(None),
range: 39..90,
module: Some(
Identifier {
id: Name("__future__"),
range: 44..54,
node_index: NodeIndex(None),
},
),
names: [
Alias {
range: 62..73,
node_index: NodeIndex(None),
name: Identifier {
id: Name("annotations"),
range: 62..73,
node_index: NodeIndex(None),
},
asname: None,
},
Alias {
range: 75..90,
node_index: NodeIndex(None),
name: Identifier {
id: Name("invalid_feature"),
range: 75..90,
node_index: NodeIndex(None),
},
asname: None,
},
],
level: 0,
},
),
ImportFrom(
StmtImportFrom {
node_index: NodeIndex(None),
range: 91..150,
module: Some(
Identifier {
id: Name("__future__"),
range: 96..106,
node_index: NodeIndex(None),
},
),
names: [
Alias {
range: 114..131,
node_index: NodeIndex(None),
name: Identifier {
id: Name("invalid_feature_1"),
range: 114..131,
node_index: NodeIndex(None),
},
asname: None,
},
Alias {
range: 133..150,
node_index: NodeIndex(None),
name: Identifier {
id: Name("invalid_feature_2"),
range: 133..150,
node_index: NodeIndex(None),
},
asname: None,
},
],
level: 0,
},
),
],
},
)
```
## Semantic Syntax Errors
|
1 | from __future__ import invalid_feature
| ^^^^^^^^^^^^^^^ Syntax Error: Future feature `invalid_feature` is not defined
2 | from __future__ import annotations, invalid_feature
3 | from __future__ import invalid_feature_1, invalid_feature_2
|
|
1 | from __future__ import invalid_feature
2 | from __future__ import annotations, invalid_feature
| ^^^^^^^^^^^^^^^ Syntax Error: Future feature `invalid_feature` is not defined
3 | from __future__ import invalid_feature_1, invalid_feature_2
|
|
1 | from __future__ import invalid_feature
2 | from __future__ import annotations, invalid_feature
3 | from __future__ import invalid_feature_1, invalid_feature_2
| ^^^^^^^^^^^^^^^^^ Syntax Error: Future feature `invalid_feature_1` is not defined
|
|
1 | from __future__ import invalid_feature
2 | from __future__ import annotations, invalid_feature
3 | from __future__ import invalid_feature_1, invalid_feature_2
| ^^^^^^^^^^^^^^^^^ Syntax Error: Future feature `invalid_feature_2` is not defined
|

42
crates/ruff_python_parser/tests/snapshots/valid_syntax@valid_future_feature.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/ok/valid_future_feature.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..35,
body: [
ImportFrom(
StmtImportFrom {
node_index: NodeIndex(None),
range: 0..34,
module: Some(
Identifier {
id: Name("__future__"),
range: 5..15,
node_index: NodeIndex(None),
},
),
names: [
Alias {
range: 23..34,
node_index: NodeIndex(None),
name: Identifier {
id: Name("annotations"),
range: 23..34,
node_index: NodeIndex(None),
},
asname: None,
},
],
level: 0,
},
),
],
},
)
```