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[syntax-errors] Star expression in index before Python 3.11 (#16544)
Summary -- This PR detects tuple unpacking expressions in index/subscript expressions before Python 3.11. Test Plan -- New inline tests
This commit is contained in:
Brent Westbrook
GitHub
parent
2cd25ef641
commit
4f2851982d
8 changed files with 933 additions and 0 deletions
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@ -0,0 +1,7 @@
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# parse_options: {"target-version": "3.10"}
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lst[*index] # simple index
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class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
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lst[a, *b, c] # different positions
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lst[a, b, *c] # different positions
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lst[*a, *b] # multiple unpacks
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array[3:5, *idxs] # mixed with slices
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@ -0,0 +1 @@
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array[*start:*end]
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@ -0,0 +1,7 @@
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# parse_options: {"target-version": "3.11"}
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lst[*index] # simple index
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class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
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lst[a, *b, c] # different positions
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lst[a, b, *c] # different positions
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lst[*a, *b] # multiple unpacks
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array[3:5, *idxs] # mixed with slices
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@ -617,6 +617,33 @@ pub enum UnsupportedSyntaxErrorKind {
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TypeAliasStatement,
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TypeParamDefault,
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/// Represents the use of a [PEP 646] star expression in an index.
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///
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/// ## Examples
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///
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/// Before Python 3.11, star expressions were not allowed in index/subscript operations (within
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/// square brackets). This restriction was lifted in [PEP 646] to allow for star-unpacking of
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/// `typing.TypeVarTuple`s, also added in Python 3.11. As such, this is the primary motivating
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/// example from the PEP:
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///
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/// ```python
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/// from typing import TypeVar, TypeVarTuple
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///
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/// DType = TypeVar('DType')
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/// Shape = TypeVarTuple('Shape')
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///
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/// class Array(Generic[DType, *Shape]): ...
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/// ```
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///
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/// But it applies to simple indexing as well:
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///
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/// ```python
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/// vector[*x]
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/// array[a, *b]
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/// ```
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///
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/// [PEP 646]: https://peps.python.org/pep-0646/#change-1-star-expressions-in-indexes
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StarExpressionInIndex,
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/// Represents the use of tuple unpacking in a `for` statement iterator clause before Python
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/// 3.9.
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///
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@ -669,6 +696,9 @@ impl Display for UnsupportedSyntaxError {
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UnsupportedSyntaxErrorKind::TypeParamDefault => {
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"Cannot set default type for a type parameter"
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}
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UnsupportedSyntaxErrorKind::StarExpressionInIndex => {
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"Cannot use star expression in index"
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}
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UnsupportedSyntaxErrorKind::UnparenthesizedUnpackInFor => {
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"Cannot use iterable unpacking in `for` statements"
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}
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@ -717,6 +747,9 @@ impl UnsupportedSyntaxErrorKind {
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UnsupportedSyntaxErrorKind::TypeParameterList => Change::Added(PythonVersion::PY312),
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UnsupportedSyntaxErrorKind::TypeAliasStatement => Change::Added(PythonVersion::PY312),
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UnsupportedSyntaxErrorKind::TypeParamDefault => Change::Added(PythonVersion::PY313),
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UnsupportedSyntaxErrorKind::StarExpressionInIndex => {
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Change::Added(PythonVersion::PY311)
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}
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UnsupportedSyntaxErrorKind::UnparenthesizedUnpackInFor => {
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Change::Added(PythonVersion::PY39)
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}
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@ -853,6 +853,35 @@ impl<'src> Parser<'src> {
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self.expect(TokenKind::Rsqb);
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// test_ok star_index_py311
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// # parse_options: {"target-version": "3.11"}
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// lst[*index] # simple index
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// class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
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// lst[a, *b, c] # different positions
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// lst[a, b, *c] # different positions
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// lst[*a, *b] # multiple unpacks
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// array[3:5, *idxs] # mixed with slices
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// test_err star_index_py310
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// # parse_options: {"target-version": "3.10"}
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// lst[*index] # simple index
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// class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
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// lst[a, *b, c] # different positions
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// lst[a, b, *c] # different positions
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// lst[*a, *b] # multiple unpacks
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// array[3:5, *idxs] # mixed with slices
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// test_err star_slices
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// array[*start:*end]
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if let Expr::Tuple(ast::ExprTuple { elts, .. }) = &slice {
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for elt in elts.iter().filter(|elt| elt.is_starred_expr()) {
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self.add_unsupported_syntax_error(
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UnsupportedSyntaxErrorKind::StarExpressionInIndex,
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elt.range(),
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);
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}
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};
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ast::ExprSubscript {
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value: Box::new(value),
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slice: Box::new(slice),
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@ -0,0 +1,420 @@
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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/star_index_py310.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..293,
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body: [
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Expr(
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StmtExpr {
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range: 44..55,
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value: Subscript(
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ExprSubscript {
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range: 44..55,
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value: Name(
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ExprName {
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range: 44..47,
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id: Name("lst"),
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 48..54,
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elts: [
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Starred(
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ExprStarred {
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range: 48..54,
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value: Name(
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ExprName {
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range: 49..54,
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id: Name("index"),
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ctx: Load,
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},
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),
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ctx: Load,
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},
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),
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],
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ctx: Load,
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parenthesized: false,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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ClassDef(
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StmtClassDef {
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range: 72..112,
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decorator_list: [],
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name: Identifier {
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id: Name("Array"),
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range: 78..83,
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},
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type_params: None,
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arguments: Some(
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Arguments {
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range: 83..107,
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args: [
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Subscript(
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ExprSubscript {
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range: 84..106,
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value: Name(
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ExprName {
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range: 84..91,
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id: Name("Generic"),
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 92..105,
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elts: [
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Name(
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ExprName {
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range: 92..97,
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id: Name("DType"),
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ctx: Load,
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},
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),
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Starred(
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ExprStarred {
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range: 99..105,
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value: Name(
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ExprName {
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range: 100..105,
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id: Name("Shape"),
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ctx: Load,
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},
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),
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ctx: Load,
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},
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),
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],
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ctx: Load,
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parenthesized: false,
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},
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),
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ctx: Load,
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},
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),
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],
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keywords: [],
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},
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),
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body: [
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Expr(
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StmtExpr {
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range: 109..112,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 109..112,
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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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Expr(
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StmtExpr {
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range: 148..161,
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value: Subscript(
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ExprSubscript {
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range: 148..161,
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value: Name(
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ExprName {
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range: 148..151,
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id: Name("lst"),
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 152..160,
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elts: [
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Name(
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ExprName {
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range: 152..153,
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id: Name("a"),
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ctx: Load,
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},
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),
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Starred(
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ExprStarred {
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range: 155..157,
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value: Name(
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ExprName {
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range: 156..157,
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id: Name("b"),
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ctx: Load,
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},
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),
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ctx: Load,
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},
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),
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Name(
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ExprName {
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range: 159..160,
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id: Name("c"),
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ctx: Load,
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},
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),
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],
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ctx: Load,
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parenthesized: false,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 185..198,
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value: Subscript(
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ExprSubscript {
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range: 185..198,
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value: Name(
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ExprName {
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range: 185..188,
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id: Name("lst"),
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 189..197,
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elts: [
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Name(
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ExprName {
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range: 189..190,
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id: Name("a"),
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ctx: Load,
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},
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),
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Name(
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ExprName {
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range: 192..193,
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id: Name("b"),
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ctx: Load,
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},
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),
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Starred(
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ExprStarred {
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range: 195..197,
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value: Name(
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ExprName {
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range: 196..197,
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id: Name("c"),
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ctx: Load,
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},
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),
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ctx: Load,
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},
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),
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],
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ctx: Load,
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parenthesized: false,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 222..233,
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value: Subscript(
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ExprSubscript {
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range: 222..233,
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value: Name(
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ExprName {
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range: 222..225,
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id: Name("lst"),
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 226..232,
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elts: [
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Starred(
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ExprStarred {
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range: 226..228,
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value: Name(
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ExprName {
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range: 227..228,
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id: Name("a"),
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ctx: Load,
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},
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),
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ctx: Load,
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},
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),
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Starred(
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ExprStarred {
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range: 230..232,
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value: Name(
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ExprName {
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range: 231..232,
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id: Name("b"),
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ctx: Load,
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},
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),
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ctx: Load,
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},
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),
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],
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ctx: Load,
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parenthesized: false,
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},
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),
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ctx: Load,
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},
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),
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},
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),
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Expr(
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StmtExpr {
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range: 254..271,
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value: Subscript(
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ExprSubscript {
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range: 254..271,
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value: Name(
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ExprName {
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range: 254..259,
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id: Name("array"),
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ctx: Load,
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},
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),
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slice: Tuple(
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ExprTuple {
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range: 260..270,
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elts: [
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Slice(
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ExprSlice {
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range: 260..263,
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lower: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 260..261,
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value: Int(
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3,
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),
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},
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),
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),
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upper: Some(
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NumberLiteral(
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ExprNumberLiteral {
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range: 262..263,
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value: Int(
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5,
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),
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},
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),
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),
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step: None,
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},
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),
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Starred(
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ExprStarred {
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range: 265..270,
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value: Name(
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ExprName {
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range: 266..270,
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id: Name("idxs"),
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ctx: Load,
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},
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),
|
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ctx: Load,
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},
|
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),
|
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],
|
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ctx: Load,
|
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parenthesized: false,
|
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},
|
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),
|
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ctx: Load,
|
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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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## Unsupported Syntax Errors
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|
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1 | # parse_options: {"target-version": "3.10"}
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2 | lst[*index] # simple index
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| ^^^^^^ Syntax Error: Cannot use star expression in index on Python 3.10 (syntax was added in Python 3.11)
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3 | class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
|
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4 | lst[a, *b, c] # different positions
|
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|
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|
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|
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|
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1 | # parse_options: {"target-version": "3.10"}
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2 | lst[*index] # simple index
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3 | class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
|
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| ^^^^^^ Syntax Error: Cannot use star expression in index on Python 3.10 (syntax was added in Python 3.11)
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4 | lst[a, *b, c] # different positions
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5 | lst[a, b, *c] # different positions
|
||||
|
|
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|
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|
||||
|
|
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2 | lst[*index] # simple index
|
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3 | class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
|
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4 | lst[a, *b, c] # different positions
|
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| ^^ Syntax Error: Cannot use star expression in index on Python 3.10 (syntax was added in Python 3.11)
|
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5 | lst[a, b, *c] # different positions
|
||||
6 | lst[*a, *b] # multiple unpacks
|
||||
|
|
||||
|
||||
|
||||
|
|
||||
3 | class Array(Generic[DType, *Shape]): ... # motivating example from the PEP
|
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4 | lst[a, *b, c] # different positions
|
||||
5 | lst[a, b, *c] # different positions
|
||||
| ^^ Syntax Error: Cannot use star expression in index on Python 3.10 (syntax was added in Python 3.11)
|
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6 | lst[*a, *b] # multiple unpacks
|
||||
7 | array[3:5, *idxs] # mixed with slices
|
||||
|
|
||||
|
||||
|
||||
|
|
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4 | lst[a, *b, c] # different positions
|
||||
5 | lst[a, b, *c] # different positions
|
||||
6 | lst[*a, *b] # multiple unpacks
|
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| ^^ Syntax Error: Cannot use star expression in index on Python 3.10 (syntax was added in Python 3.11)
|
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7 | array[3:5, *idxs] # mixed with slices
|
||||
|
|
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|
||||
|
||||
|
|
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4 | lst[a, *b, c] # different positions
|
||||
5 | lst[a, b, *c] # different positions
|
||||
6 | lst[*a, *b] # multiple unpacks
|
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| ^^ Syntax Error: Cannot use star expression in index on Python 3.10 (syntax was added in Python 3.11)
|
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7 | array[3:5, *idxs] # mixed with slices
|
||||
|
|
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|
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|
||||
|
|
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5 | lst[a, b, *c] # different positions
|
||||
6 | lst[*a, *b] # multiple unpacks
|
||||
7 | array[3:5, *idxs] # mixed with slices
|
||||
| ^^^^^ Syntax Error: Cannot use star expression in index on Python 3.10 (syntax was added in Python 3.11)
|
||||
|
|
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|
|
@ -0,0 +1,81 @@
|
|||
---
|
||||
source: crates/ruff_python_parser/tests/fixtures.rs
|
||||
input_file: crates/ruff_python_parser/resources/inline/err/star_slices.py
|
||||
---
|
||||
## AST
|
||||
|
||||
```
|
||||
Module(
|
||||
ModModule {
|
||||
range: 0..19,
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 0..18,
|
||||
value: Subscript(
|
||||
ExprSubscript {
|
||||
range: 0..18,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 0..5,
|
||||
id: Name("array"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Slice(
|
||||
ExprSlice {
|
||||
range: 6..17,
|
||||
lower: Some(
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 6..12,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 7..12,
|
||||
id: Name("start"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
),
|
||||
upper: Some(
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 13..17,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 14..17,
|
||||
id: Name("end"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
),
|
||||
step: None,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
)
|
||||
```
|
||||
## Errors
|
||||
|
||||
|
|
||||
1 | array[*start:*end]
|
||||
| ^^^^^^ Syntax Error: Starred expression cannot be used here
|
||||
|
|
||||
|
||||
|
||||
|
|
||||
1 | array[*start:*end]
|
||||
| ^^^^ Syntax Error: Starred expression cannot be used here
|
||||
|
|
||||
|
|
@ -0,0 +1,355 @@
|
|||
---
|
||||
source: crates/ruff_python_parser/tests/fixtures.rs
|
||||
input_file: crates/ruff_python_parser/resources/inline/ok/star_index_py311.py
|
||||
---
|
||||
## AST
|
||||
|
||||
```
|
||||
Module(
|
||||
ModModule {
|
||||
range: 0..293,
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 44..55,
|
||||
value: Subscript(
|
||||
ExprSubscript {
|
||||
range: 44..55,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 44..47,
|
||||
id: Name("lst"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Tuple(
|
||||
ExprTuple {
|
||||
range: 48..54,
|
||||
elts: [
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 48..54,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 49..54,
|
||||
id: Name("index"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
parenthesized: false,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
ClassDef(
|
||||
StmtClassDef {
|
||||
range: 72..112,
|
||||
decorator_list: [],
|
||||
name: Identifier {
|
||||
id: Name("Array"),
|
||||
range: 78..83,
|
||||
},
|
||||
type_params: None,
|
||||
arguments: Some(
|
||||
Arguments {
|
||||
range: 83..107,
|
||||
args: [
|
||||
Subscript(
|
||||
ExprSubscript {
|
||||
range: 84..106,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 84..91,
|
||||
id: Name("Generic"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Tuple(
|
||||
ExprTuple {
|
||||
range: 92..105,
|
||||
elts: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 92..97,
|
||||
id: Name("DType"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 99..105,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 100..105,
|
||||
id: Name("Shape"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
parenthesized: false,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
keywords: [],
|
||||
},
|
||||
),
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 109..112,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 109..112,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 148..161,
|
||||
value: Subscript(
|
||||
ExprSubscript {
|
||||
range: 148..161,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 148..151,
|
||||
id: Name("lst"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Tuple(
|
||||
ExprTuple {
|
||||
range: 152..160,
|
||||
elts: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 152..153,
|
||||
id: Name("a"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 155..157,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 156..157,
|
||||
id: Name("b"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Name(
|
||||
ExprName {
|
||||
range: 159..160,
|
||||
id: Name("c"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
parenthesized: false,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 185..198,
|
||||
value: Subscript(
|
||||
ExprSubscript {
|
||||
range: 185..198,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 185..188,
|
||||
id: Name("lst"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Tuple(
|
||||
ExprTuple {
|
||||
range: 189..197,
|
||||
elts: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 189..190,
|
||||
id: Name("a"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Name(
|
||||
ExprName {
|
||||
range: 192..193,
|
||||
id: Name("b"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 195..197,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 196..197,
|
||||
id: Name("c"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
parenthesized: false,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 222..233,
|
||||
value: Subscript(
|
||||
ExprSubscript {
|
||||
range: 222..233,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 222..225,
|
||||
id: Name("lst"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Tuple(
|
||||
ExprTuple {
|
||||
range: 226..232,
|
||||
elts: [
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 226..228,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 227..228,
|
||||
id: Name("a"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 230..232,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 231..232,
|
||||
id: Name("b"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
parenthesized: false,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 254..271,
|
||||
value: Subscript(
|
||||
ExprSubscript {
|
||||
range: 254..271,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 254..259,
|
||||
id: Name("array"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
slice: Tuple(
|
||||
ExprTuple {
|
||||
range: 260..270,
|
||||
elts: [
|
||||
Slice(
|
||||
ExprSlice {
|
||||
range: 260..263,
|
||||
lower: Some(
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 260..261,
|
||||
value: Int(
|
||||
3,
|
||||
),
|
||||
},
|
||||
),
|
||||
),
|
||||
upper: Some(
|
||||
NumberLiteral(
|
||||
ExprNumberLiteral {
|
||||
range: 262..263,
|
||||
value: Int(
|
||||
5,
|
||||
),
|
||||
},
|
||||
),
|
||||
),
|
||||
step: None,
|
||||
},
|
||||
),
|
||||
Starred(
|
||||
ExprStarred {
|
||||
range: 265..270,
|
||||
value: Name(
|
||||
ExprName {
|
||||
range: 266..270,
|
||||
id: Name("idxs"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
parenthesized: false,
|
||||
},
|
||||
),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
)
|
||||
```
|
||||
Loading…
Add table
Add a link
Reference in a new issue