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[syntax-errors] Single starred assignment target (#17024)
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Summary
--
Detects starred assignment targets outside of tuples and lists like `*a
= (1,)`.
This PR only considers assignment statements. I also checked annotated
assigment statements, but these give a separate error that we already
catch, so I think they're okay not to consider:
```pycon
>>> *a: list[int] = []
File "<python-input-72>", line 1
*a: list[int] = []
^
SyntaxError: invalid syntax
```
Fixes #13759
Test Plan
--
New inline tests, plus a new `SemanticSyntaxError` for an existing
parser test. I also removed a now-invalid case from an otherwise-valid
test fixture.
The new semantic error leads to two errors for the case below:
```python
*foo() = 42
```
but this matches [pyright] too.
[pyright]: https://pyright-play.net/?code=FQMw9mAUCUAEC8sAsAmAUEA
This commit is contained in:
Brent Westbrook
GitHub
parent
a0819f0c51
commit
ab1011ce70
9 changed files with 365 additions and 138 deletions
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@ -0,0 +1 @@
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*a = (1,)
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@ -0,0 +1,3 @@
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(*a,) = (1,)
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*a, = (1,)
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[*a] = (1,)
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@ -14,8 +14,6 @@ x[y] = (1, 2, 3)
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# This last group of tests checks that assignments we expect to be parsed
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# (including some interesting ones) continue to be parsed successfully.
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*foo = 42
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[x, y, z] = [1, 2, 3]
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(x, y, z) = (1, 2, 3)
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@ -73,6 +73,22 @@ impl SemanticSyntaxChecker {
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Self::duplicate_type_parameter_name(type_params, ctx);
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}
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}
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Stmt::Assign(ast::StmtAssign { targets, .. }) => {
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if let [Expr::Starred(ast::ExprStarred { range, .. })] = targets.as_slice() {
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// test_ok single_starred_assignment_target
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// (*a,) = (1,)
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// *a, = (1,)
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// [*a] = (1,)
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// test_err single_starred_assignment_target
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// *a = (1,)
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Self::add_error(
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ctx,
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SemanticSyntaxErrorKind::SingleStarredAssignment,
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*range,
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);
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}
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}
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_ => {}
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}
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@ -437,6 +453,9 @@ impl Display for SemanticSyntaxError {
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f.write_str("wildcard makes remaining patterns unreachable")
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}
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},
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SemanticSyntaxErrorKind::SingleStarredAssignment => {
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f.write_str("starred assignment target must be in a list or tuple")
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}
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SemanticSyntaxErrorKind::WriteToDebug(kind) => match kind {
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WriteToDebugKind::Store => f.write_str("cannot assign to `__debug__`"),
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WriteToDebugKind::Delete(python_version) => {
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@ -522,6 +541,23 @@ pub enum SemanticSyntaxErrorKind {
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/// [Python reference]: https://docs.python.org/3/reference/compound_stmts.html#irrefutable-case-blocks
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IrrefutableCasePattern(IrrefutablePatternKind),
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/// Represents a single starred assignment target outside of a tuple or list.
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///
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/// ## Examples
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///
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/// ```python
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/// *a = (1,) # SyntaxError
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/// ```
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///
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/// A starred assignment target can only occur within a tuple or list:
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///
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/// ```python
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/// b, *a = 1, 2, 3
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/// (*a,) = 1, 2, 3
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/// [*a] = 1, 2, 3
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/// ```
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SingleStarredAssignment,
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/// Represents a write to `__debug__`. This includes simple assignments and deletions as well
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/// other kinds of statements that can introduce bindings, such as type parameters in functions,
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/// classes, and aliases, `match` arms, and imports, among others.
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@ -0,0 +1,58 @@
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---
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source: crates/ruff_python_parser/tests/fixtures.rs
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input_file: crates/ruff_python_parser/resources/inline/err/single_starred_assignment_target.py
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---
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## AST
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```
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Module(
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ModModule {
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range: 0..10,
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body: [
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Assign(
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StmtAssign {
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range: 0..9,
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targets: [
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Starred(
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ExprStarred {
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range: 0..2,
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value: Name(
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ExprName {
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range: 1..2,
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id: Name("a"),
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ctx: Store,
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},
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),
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ctx: Store,
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},
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),
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],
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value: Tuple(
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ExprTuple {
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range: 5..9,
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elts: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 6..7,
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value: Int(
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1,
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),
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},
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),
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],
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ctx: Load,
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parenthesized: true,
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},
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),
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},
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),
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],
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},
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)
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```
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## Semantic Syntax Errors
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1 | *a = (1,)
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| ^^ Syntax Error: starred assignment target must be in a list or tuple
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@ -1690,3 +1690,15 @@ Module(
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42 | (x, foo(), y) = (42, 42, 42)
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| ^^^^^ Syntax Error: Invalid assignment target
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## Semantic Syntax Errors
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37 | None = 42
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38 | ... = 42
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39 | *foo() = 42
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| ^^^^^^ Syntax Error: starred assignment target must be in a list or tuple
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40 | [x, foo(), y] = [42, 42, 42]
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41 | [[a, b], [[42]], d] = [[1, 2], [[3]], 4]
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@ -0,0 +1,152 @@
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---
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source: crates/ruff_python_parser/tests/fixtures.rs
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input_file: crates/ruff_python_parser/resources/inline/ok/single_starred_assignment_target.py
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---
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## AST
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```
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Module(
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ModModule {
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range: 0..36,
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body: [
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Assign(
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StmtAssign {
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range: 0..12,
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targets: [
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Tuple(
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ExprTuple {
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range: 0..5,
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elts: [
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Starred(
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ExprStarred {
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range: 1..3,
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value: Name(
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ExprName {
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range: 2..3,
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id: Name("a"),
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ctx: Store,
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},
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),
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ctx: Store,
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},
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),
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],
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ctx: Store,
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parenthesized: true,
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},
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),
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],
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value: Tuple(
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ExprTuple {
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range: 8..12,
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elts: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 9..10,
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value: Int(
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1,
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),
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},
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),
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],
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ctx: Load,
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parenthesized: true,
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},
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),
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},
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),
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Assign(
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StmtAssign {
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range: 13..23,
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targets: [
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Tuple(
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ExprTuple {
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range: 13..16,
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elts: [
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Starred(
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ExprStarred {
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range: 13..15,
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value: Name(
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ExprName {
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range: 14..15,
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id: Name("a"),
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ctx: Store,
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},
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),
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ctx: Store,
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},
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),
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],
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ctx: Store,
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parenthesized: false,
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},
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),
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],
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value: Tuple(
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ExprTuple {
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range: 19..23,
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elts: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 20..21,
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value: Int(
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1,
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),
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},
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),
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],
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ctx: Load,
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parenthesized: true,
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},
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),
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},
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),
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Assign(
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StmtAssign {
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range: 24..35,
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targets: [
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List(
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ExprList {
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range: 24..28,
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elts: [
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Starred(
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ExprStarred {
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range: 25..27,
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value: Name(
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ExprName {
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range: 26..27,
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id: Name("a"),
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ctx: Store,
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},
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),
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ctx: Store,
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},
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),
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],
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ctx: Store,
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},
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),
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],
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value: Tuple(
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ExprTuple {
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range: 31..35,
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elts: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 32..33,
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value: Int(
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1,
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),
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},
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),
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],
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ctx: Load,
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parenthesized: true,
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},
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),
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},
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),
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],
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},
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)
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```
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@ -1,14 +1,13 @@
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---
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source: crates/ruff_python_parser/tests/fixtures.rs
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input_file: crates/ruff_python_parser/resources/valid/statement/assignment.py
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snapshot_kind: text
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---
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## AST
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```
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Module(
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ModModule {
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range: 0..734,
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range: 0..723,
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body: [
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Assign(
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StmtAssign {
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@ -370,57 +369,29 @@ Module(
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),
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Assign(
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StmtAssign {
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range: 259..268,
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targets: [
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Starred(
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ExprStarred {
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range: 259..263,
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value: Name(
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ExprName {
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range: 260..263,
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id: Name("foo"),
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ctx: Store,
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},
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),
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ctx: Store,
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},
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),
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],
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value: NumberLiteral(
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ExprNumberLiteral {
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range: 266..268,
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value: Int(
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42,
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),
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},
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),
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},
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),
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Assign(
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StmtAssign {
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range: 270..291,
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range: 259..280,
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targets: [
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List(
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ExprList {
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range: 270..279,
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range: 259..268,
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elts: [
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Name(
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ExprName {
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range: 271..272,
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range: 260..261,
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id: Name("x"),
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ctx: Store,
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},
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),
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Name(
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ExprName {
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range: 274..275,
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range: 263..264,
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id: Name("y"),
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ctx: Store,
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},
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),
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Name(
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ExprName {
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range: 277..278,
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range: 266..267,
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id: Name("z"),
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ctx: Store,
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},
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@ -432,11 +403,11 @@ Module(
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],
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value: List(
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ExprList {
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range: 282..291,
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range: 271..280,
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elts: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 283..284,
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range: 272..273,
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value: Int(
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1,
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),
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@ -444,7 +415,7 @@ Module(
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),
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NumberLiteral(
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ExprNumberLiteral {
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range: 286..287,
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range: 275..276,
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value: Int(
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2,
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),
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|
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@ -452,7 +423,7 @@ Module(
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),
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NumberLiteral(
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ExprNumberLiteral {
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range: 289..290,
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range: 278..279,
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value: Int(
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3,
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),
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@ -466,29 +437,29 @@ Module(
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),
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Assign(
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StmtAssign {
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range: 293..314,
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range: 282..303,
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targets: [
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Tuple(
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ExprTuple {
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range: 293..302,
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range: 282..291,
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elts: [
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Name(
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ExprName {
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range: 294..295,
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range: 283..284,
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id: Name("x"),
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ctx: Store,
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},
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),
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Name(
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ExprName {
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range: 297..298,
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range: 286..287,
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id: Name("y"),
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ctx: Store,
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},
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),
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Name(
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ExprName {
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range: 300..301,
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range: 289..290,
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id: Name("z"),
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ctx: Store,
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},
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|
|
@ -501,11 +472,11 @@ Module(
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],
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value: Tuple(
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ExprTuple {
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range: 305..314,
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range: 294..303,
|
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elts: [
|
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NumberLiteral(
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ExprNumberLiteral {
|
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range: 306..307,
|
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range: 295..296,
|
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value: Int(
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1,
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),
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|
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@ -513,7 +484,7 @@ Module(
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),
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NumberLiteral(
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ExprNumberLiteral {
|
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range: 309..310,
|
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range: 298..299,
|
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value: Int(
|
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2,
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),
|
||||
|
|
@ -521,7 +492,7 @@ Module(
|
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),
|
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NumberLiteral(
|
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ExprNumberLiteral {
|
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range: 312..313,
|
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range: 301..302,
|
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value: Int(
|
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3,
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),
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|
|
@ -536,21 +507,21 @@ Module(
|
|||
),
|
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Assign(
|
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StmtAssign {
|
||||
range: 315..324,
|
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range: 304..313,
|
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targets: [
|
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Subscript(
|
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ExprSubscript {
|
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range: 315..319,
|
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range: 304..308,
|
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value: Name(
|
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ExprName {
|
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range: 315..316,
|
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range: 304..305,
|
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id: Name("x"),
|
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ctx: Load,
|
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},
|
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),
|
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slice: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 317..318,
|
||||
range: 306..307,
|
||||
value: Int(
|
||||
0,
|
||||
),
|
||||
|
|
@ -562,7 +533,7 @@ Module(
|
|||
],
|
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value: NumberLiteral(
|
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ExprNumberLiteral {
|
||||
range: 322..324,
|
||||
range: 311..313,
|
||||
value: Int(
|
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42,
|
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),
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||||
|
|
@ -572,14 +543,14 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 421..430,
|
||||
range: 410..419,
|
||||
targets: [
|
||||
Subscript(
|
||||
ExprSubscript {
|
||||
range: 421..425,
|
||||
range: 410..414,
|
||||
value: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 421..422,
|
||||
range: 410..411,
|
||||
value: Int(
|
||||
5,
|
||||
),
|
||||
|
|
@ -587,7 +558,7 @@ Module(
|
|||
),
|
||||
slice: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 423..424,
|
||||
range: 412..413,
|
||||
value: Int(
|
||||
0,
|
||||
),
|
||||
|
|
@ -599,7 +570,7 @@ Module(
|
|||
],
|
||||
value: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 428..430,
|
||||
range: 417..419,
|
||||
value: Int(
|
||||
42,
|
||||
),
|
||||
|
|
@ -609,25 +580,25 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 431..444,
|
||||
range: 420..433,
|
||||
targets: [
|
||||
Subscript(
|
||||
ExprSubscript {
|
||||
range: 431..437,
|
||||
range: 420..426,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 431..432,
|
||||
range: 420..421,
|
||||
id: Name("x"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Slice(
|
||||
ExprSlice {
|
||||
range: 433..436,
|
||||
range: 422..425,
|
||||
lower: Some(
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 433..434,
|
||||
range: 422..423,
|
||||
value: Int(
|
||||
1,
|
||||
),
|
||||
|
|
@ -637,7 +608,7 @@ Module(
|
|||
upper: Some(
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 435..436,
|
||||
range: 424..425,
|
||||
value: Int(
|
||||
2,
|
||||
),
|
||||
|
|
@ -653,11 +624,11 @@ Module(
|
|||
],
|
||||
value: List(
|
||||
ExprList {
|
||||
range: 440..444,
|
||||
range: 429..433,
|
||||
elts: [
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 441..443,
|
||||
range: 430..432,
|
||||
value: Int(
|
||||
42,
|
||||
),
|
||||
|
|
@ -671,14 +642,14 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 540..553,
|
||||
range: 529..542,
|
||||
targets: [
|
||||
Subscript(
|
||||
ExprSubscript {
|
||||
range: 540..546,
|
||||
range: 529..535,
|
||||
value: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 540..541,
|
||||
range: 529..530,
|
||||
value: Int(
|
||||
5,
|
||||
),
|
||||
|
|
@ -686,11 +657,11 @@ Module(
|
|||
),
|
||||
slice: Slice(
|
||||
ExprSlice {
|
||||
range: 542..545,
|
||||
range: 531..534,
|
||||
lower: Some(
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 542..543,
|
||||
range: 531..532,
|
||||
value: Int(
|
||||
1,
|
||||
),
|
||||
|
|
@ -700,7 +671,7 @@ Module(
|
|||
upper: Some(
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 544..545,
|
||||
range: 533..534,
|
||||
value: Int(
|
||||
2,
|
||||
),
|
||||
|
|
@ -716,11 +687,11 @@ Module(
|
|||
],
|
||||
value: List(
|
||||
ExprList {
|
||||
range: 549..553,
|
||||
range: 538..542,
|
||||
elts: [
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 550..552,
|
||||
range: 539..541,
|
||||
value: Int(
|
||||
42,
|
||||
),
|
||||
|
|
@ -734,21 +705,21 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 555..567,
|
||||
range: 544..556,
|
||||
targets: [
|
||||
Attribute(
|
||||
ExprAttribute {
|
||||
range: 555..562,
|
||||
range: 544..551,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 555..558,
|
||||
range: 544..547,
|
||||
id: Name("foo"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
attr: Identifier {
|
||||
id: Name("bar"),
|
||||
range: 559..562,
|
||||
range: 548..551,
|
||||
},
|
||||
ctx: Store,
|
||||
},
|
||||
|
|
@ -756,7 +727,7 @@ Module(
|
|||
],
|
||||
value: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 565..567,
|
||||
range: 554..556,
|
||||
value: Int(
|
||||
42,
|
||||
),
|
||||
|
|
@ -766,18 +737,18 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 669..681,
|
||||
range: 658..670,
|
||||
targets: [
|
||||
Attribute(
|
||||
ExprAttribute {
|
||||
range: 669..676,
|
||||
range: 658..665,
|
||||
value: StringLiteral(
|
||||
ExprStringLiteral {
|
||||
range: 669..674,
|
||||
range: 658..663,
|
||||
value: StringLiteralValue {
|
||||
inner: Single(
|
||||
StringLiteral {
|
||||
range: 669..674,
|
||||
range: 658..663,
|
||||
value: "foo",
|
||||
flags: StringLiteralFlags {
|
||||
quote_style: Double,
|
||||
|
|
@ -791,7 +762,7 @@ Module(
|
|||
),
|
||||
attr: Identifier {
|
||||
id: Name("y"),
|
||||
range: 675..676,
|
||||
range: 664..665,
|
||||
},
|
||||
ctx: Store,
|
||||
},
|
||||
|
|
@ -799,7 +770,7 @@ Module(
|
|||
],
|
||||
value: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 679..681,
|
||||
range: 668..670,
|
||||
value: Int(
|
||||
42,
|
||||
),
|
||||
|
|
@ -809,11 +780,11 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 683..691,
|
||||
range: 672..680,
|
||||
targets: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 683..686,
|
||||
range: 672..675,
|
||||
id: Name("foo"),
|
||||
ctx: Store,
|
||||
},
|
||||
|
|
@ -821,7 +792,7 @@ Module(
|
|||
],
|
||||
value: NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 689..691,
|
||||
range: 678..680,
|
||||
value: Int(
|
||||
42,
|
||||
),
|
||||
|
|
@ -829,15 +800,43 @@ Module(
|
|||
),
|
||||
},
|
||||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 682..692,
|
||||
targets: [
|
||||
List(
|
||||
ExprList {
|
||||
range: 682..684,
|
||||
elts: [],
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
],
|
||||
value: Starred(
|
||||
ExprStarred {
|
||||
range: 687..692,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 688..692,
|
||||
id: Name("data"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 693..703,
|
||||
targets: [
|
||||
List(
|
||||
ExprList {
|
||||
Tuple(
|
||||
ExprTuple {
|
||||
range: 693..695,
|
||||
elts: [],
|
||||
ctx: Store,
|
||||
parenthesized: true,
|
||||
},
|
||||
),
|
||||
],
|
||||
|
|
@ -858,50 +857,22 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 704..714,
|
||||
range: 704..713,
|
||||
targets: [
|
||||
Tuple(
|
||||
ExprTuple {
|
||||
range: 704..706,
|
||||
elts: [],
|
||||
ctx: Store,
|
||||
parenthesized: true,
|
||||
},
|
||||
),
|
||||
],
|
||||
value: Starred(
|
||||
ExprStarred {
|
||||
range: 709..714,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 710..714,
|
||||
id: Name("data"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 715..724,
|
||||
targets: [
|
||||
Tuple(
|
||||
ExprTuple {
|
||||
range: 715..719,
|
||||
range: 704..708,
|
||||
elts: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 715..716,
|
||||
range: 704..705,
|
||||
id: Name("a"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
Name(
|
||||
ExprName {
|
||||
range: 718..719,
|
||||
range: 707..708,
|
||||
id: Name("b"),
|
||||
ctx: Store,
|
||||
},
|
||||
|
|
@ -914,7 +885,7 @@ Module(
|
|||
],
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 722..724,
|
||||
range: 711..713,
|
||||
id: Name("ab"),
|
||||
ctx: Load,
|
||||
},
|
||||
|
|
@ -923,18 +894,18 @@ Module(
|
|||
),
|
||||
Assign(
|
||||
StmtAssign {
|
||||
range: 725..734,
|
||||
range: 714..723,
|
||||
targets: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 725..726,
|
||||
range: 714..715,
|
||||
id: Name("a"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
Name(
|
||||
ExprName {
|
||||
range: 729..730,
|
||||
range: 718..719,
|
||||
id: Name("b"),
|
||||
ctx: Store,
|
||||
},
|
||||
|
|
@ -942,7 +913,7 @@ Module(
|
|||
],
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 733..734,
|
||||
range: 722..723,
|
||||
id: Name("c"),
|
||||
ctx: Load,
|
||||
},
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue