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[syntax-errors] Parenthesized context managers before Python 3.9 (#16523)
Summary -- I thought this was very complicated based on the comment here: https://github.com/astral-sh/ruff/pull/16106#issuecomment-2653505671 and on some of the discussion in the CPython issue here: https://github.com/python/cpython/issues/56991. However, after a little bit of experimentation, I think it boils down to this example: ```python with (x as y): ... ``` The issue is parentheses around a `with` item with an `optional_var`, as we (and [Python](https://docs.python.org/3/library/ast.html#ast.withitem)) call the trailing variable name (`y` in this case). It's not actually about line breaks after all, except that line breaks are allowed in parenthesized expressions, which explains the validity of cases like ```pycon >>> with ( ... x, ... y ... ) as foo: ... pass ... ``` even on Python 3.8. I followed [pyright]'s example again here on the diagnostic range (just the opening paren) and the wording of the error. Test Plan -- Inline tests [pyright]: https://pyright-play.net/?pythonVersion=3.7&strict=true&code=FAdwlgLgFgBAFAewA4FMB2cBEAzBCB0EAHhJgJQwCGAzjLgmQFwz6tA
This commit is contained in:
Brent Westbrook
GitHub
parent
8d3643f409
commit
75a562d313
10 changed files with 800 additions and 0 deletions
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@ -0,0 +1,4 @@
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# parse_options: {"target-version": "3.8"}
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with (foo as x, bar as y): ...
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with (foo, bar as y): ...
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with (foo as x, bar): ...
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@ -0,0 +1,13 @@
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# parse_options: {"target-version": "3.8"}
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# these cases are _syntactically_ valid before Python 3.9 because the `with` item
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# is parsed as a tuple, but this will always cause a runtime error, so we flag it
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# anyway
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with (foo, bar): ...
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with (
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open('foo.txt')) as foo: ...
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with (
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foo,
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bar,
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baz,
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): ...
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with (foo,): ...
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@ -0,0 +1,4 @@
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# parse_options: {"target-version": "3.9"}
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with (foo as x, bar as y): ...
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with (foo, bar as y): ...
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with (foo as x, bar): ...
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@ -0,0 +1,6 @@
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# parse_options: {"target-version": "3.8"}
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with (
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foo,
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bar,
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baz,
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) as tup: ...
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@ -661,6 +661,46 @@ pub enum UnsupportedSyntaxErrorKind {
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TypeAliasStatement,
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TypeParamDefault,
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/// Represents the use of a parenthesized `with` item before Python 3.9.
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///
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/// ## Examples
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///
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/// As described in [BPO 12782], `with` uses like this were not allowed on Python 3.8:
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///
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/// ```python
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/// with (open("a_really_long_foo") as foo,
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/// open("a_really_long_bar") as bar):
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/// pass
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/// ```
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///
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/// because parentheses were not allowed within the `with` statement itself (see [this comment]
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/// in particular). However, parenthesized expressions were still allowed, including the cases
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/// below, so the issue can be pretty subtle and relates specifically to parenthesized items
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/// with `as` bindings.
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///
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/// ```python
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/// with (foo, bar): ... # okay
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/// with (
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/// open('foo.txt')) as foo: ... # also okay
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/// with (
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/// foo,
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/// bar,
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/// baz,
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/// ): ... # also okay, just a tuple
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/// with (
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/// foo,
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/// bar,
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/// baz,
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/// ) as tup: ... # also okay, binding the tuple
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/// ```
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///
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/// This restriction was lifted in 3.9 but formally included in the [release notes] for 3.10.
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///
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/// [BPO 12782]: https://github.com/python/cpython/issues/56991
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/// [this comment]: https://github.com/python/cpython/issues/56991#issuecomment-1093555141
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/// [release notes]: https://docs.python.org/3/whatsnew/3.10.html#summary-release-highlights
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ParenthesizedContextManager,
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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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@ -798,6 +838,9 @@ 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::ParenthesizedContextManager => {
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"Cannot use parentheses within a `with` statement"
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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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@ -861,6 +904,9 @@ 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::ParenthesizedContextManager => {
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Change::Added(PythonVersion::PY39)
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}
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UnsupportedSyntaxErrorKind::StarExpressionInIndex => {
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Change::Added(PythonVersion::PY311)
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}
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@ -2066,8 +2066,49 @@ impl<'src> Parser<'src> {
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return vec![];
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}
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let open_paren_range = self.current_token_range();
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if self.at(TokenKind::Lpar) {
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if let Some(items) = self.try_parse_parenthesized_with_items() {
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// test_ok tuple_context_manager_py38
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// # parse_options: {"target-version": "3.8"}
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// with (
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// foo,
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// bar,
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// baz,
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// ) as tup: ...
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// test_err tuple_context_manager_py38
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// # parse_options: {"target-version": "3.8"}
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// # these cases are _syntactically_ valid before Python 3.9 because the `with` item
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// # is parsed as a tuple, but this will always cause a runtime error, so we flag it
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// # anyway
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// with (foo, bar): ...
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// with (
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// open('foo.txt')) as foo: ...
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// with (
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// foo,
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// bar,
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// baz,
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// ): ...
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// with (foo,): ...
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// test_ok parenthesized_context_manager_py39
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// # parse_options: {"target-version": "3.9"}
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// with (foo as x, bar as y): ...
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// with (foo, bar as y): ...
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// with (foo as x, bar): ...
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// test_err parenthesized_context_manager_py38
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// # parse_options: {"target-version": "3.8"}
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// with (foo as x, bar as y): ...
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// with (foo, bar as y): ...
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// with (foo as x, bar): ...
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self.add_unsupported_syntax_error(
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UnsupportedSyntaxErrorKind::ParenthesizedContextManager,
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open_paren_range,
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);
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self.expect(TokenKind::Rpar);
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items
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} else {
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@ -0,0 +1,199 @@
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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/parenthesized_context_manager_py38.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..126,
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body: [
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With(
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StmtWith {
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range: 43..73,
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is_async: false,
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items: [
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WithItem {
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range: 49..57,
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context_expr: Name(
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ExprName {
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range: 49..52,
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id: Name("foo"),
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ctx: Load,
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},
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),
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optional_vars: Some(
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Name(
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ExprName {
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range: 56..57,
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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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),
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},
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WithItem {
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range: 59..67,
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context_expr: Name(
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ExprName {
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range: 59..62,
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id: Name("bar"),
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ctx: Load,
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},
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),
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optional_vars: Some(
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Name(
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ExprName {
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range: 66..67,
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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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),
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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: 70..73,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 70..73,
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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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With(
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StmtWith {
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range: 74..99,
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is_async: false,
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items: [
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WithItem {
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range: 80..83,
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context_expr: Name(
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ExprName {
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range: 80..83,
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id: Name("foo"),
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ctx: Load,
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},
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),
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optional_vars: None,
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},
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WithItem {
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range: 85..93,
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context_expr: Name(
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ExprName {
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range: 85..88,
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id: Name("bar"),
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ctx: Load,
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},
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),
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optional_vars: Some(
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Name(
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ExprName {
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range: 92..93,
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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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),
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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: 96..99,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 96..99,
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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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With(
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StmtWith {
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range: 100..125,
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is_async: false,
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items: [
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WithItem {
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range: 106..114,
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context_expr: Name(
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ExprName {
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range: 106..109,
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id: Name("foo"),
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ctx: Load,
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},
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),
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optional_vars: Some(
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Name(
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ExprName {
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range: 113..114,
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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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),
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},
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WithItem {
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range: 116..119,
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context_expr: Name(
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ExprName {
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range: 116..119,
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id: Name("bar"),
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ctx: Load,
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},
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),
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optional_vars: None,
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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: 122..125,
|
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value: EllipsisLiteral(
|
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ExprEllipsisLiteral {
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range: 122..125,
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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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},
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)
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```
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## Unsupported Syntax Errors
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1 | # parse_options: {"target-version": "3.8"}
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2 | with (foo as x, bar as y): ...
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| ^ Syntax Error: Cannot use parentheses within a `with` statement on Python 3.8 (syntax was added in Python 3.9)
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3 | with (foo, bar as y): ...
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4 | with (foo as x, bar): ...
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|
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|
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1 | # parse_options: {"target-version": "3.8"}
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2 | with (foo as x, bar as y): ...
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3 | with (foo, bar as y): ...
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| ^ Syntax Error: Cannot use parentheses within a `with` statement on Python 3.8 (syntax was added in Python 3.9)
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4 | with (foo as x, bar): ...
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|
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2 | with (foo as x, bar as y): ...
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3 | with (foo, bar as y): ...
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4 | with (foo as x, bar): ...
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| ^ Syntax Error: Cannot use parentheses within a `with` statement on Python 3.8 (syntax was added in Python 3.9)
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|
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@ -0,0 +1,237 @@
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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/tuple_context_manager_py38.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..327,
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body: [
|
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With(
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StmtWith {
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range: 216..236,
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is_async: false,
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items: [
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WithItem {
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range: 222..225,
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context_expr: Name(
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ExprName {
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range: 222..225,
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id: Name("foo"),
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ctx: Load,
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},
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),
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optional_vars: None,
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},
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WithItem {
|
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range: 227..230,
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context_expr: Name(
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ExprName {
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range: 227..230,
|
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id: Name("bar"),
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ctx: Load,
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},
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),
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optional_vars: None,
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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: 233..236,
|
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value: EllipsisLiteral(
|
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ExprEllipsisLiteral {
|
||||
range: 233..236,
|
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},
|
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),
|
||||
},
|
||||
),
|
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],
|
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},
|
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),
|
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With(
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StmtWith {
|
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range: 237..274,
|
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is_async: false,
|
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items: [
|
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WithItem {
|
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range: 242..269,
|
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context_expr: Call(
|
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ExprCall {
|
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range: 246..261,
|
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func: Name(
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ExprName {
|
||||
range: 246..250,
|
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id: Name("open"),
|
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ctx: Load,
|
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},
|
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),
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arguments: Arguments {
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range: 250..261,
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args: [
|
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StringLiteral(
|
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ExprStringLiteral {
|
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range: 251..260,
|
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value: StringLiteralValue {
|
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inner: Single(
|
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StringLiteral {
|
||||
range: 251..260,
|
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value: "foo.txt",
|
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flags: StringLiteralFlags {
|
||||
quote_style: Single,
|
||||
prefix: Empty,
|
||||
triple_quoted: false,
|
||||
},
|
||||
},
|
||||
),
|
||||
},
|
||||
},
|
||||
),
|
||||
],
|
||||
keywords: [],
|
||||
},
|
||||
},
|
||||
),
|
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optional_vars: Some(
|
||||
Name(
|
||||
ExprName {
|
||||
range: 266..269,
|
||||
id: Name("foo"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
),
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 271..274,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 271..274,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
With(
|
||||
StmtWith {
|
||||
range: 275..309,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 284..287,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 284..287,
|
||||
id: Name("foo"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
WithItem {
|
||||
range: 291..294,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 291..294,
|
||||
id: Name("bar"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
WithItem {
|
||||
range: 298..301,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 298..301,
|
||||
id: Name("baz"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 306..309,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 306..309,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
With(
|
||||
StmtWith {
|
||||
range: 310..326,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 316..319,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 316..319,
|
||||
id: Name("foo"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 323..326,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 323..326,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
)
|
||||
```
|
||||
## Unsupported Syntax Errors
|
||||
|
||||
|
|
||||
3 | # is parsed as a tuple, but this will always cause a runtime error, so we flag it
|
||||
4 | # anyway
|
||||
5 | with (foo, bar): ...
|
||||
| ^ Syntax Error: Cannot use parentheses within a `with` statement on Python 3.8 (syntax was added in Python 3.9)
|
||||
6 | with (
|
||||
7 | open('foo.txt')) as foo: ...
|
||||
|
|
||||
|
||||
|
||||
|
|
||||
6 | with (
|
||||
7 | open('foo.txt')) as foo: ...
|
||||
8 | with (
|
||||
| ^ Syntax Error: Cannot use parentheses within a `with` statement on Python 3.8 (syntax was added in Python 3.9)
|
||||
9 | foo,
|
||||
10 | bar,
|
||||
|
|
||||
|
||||
|
||||
|
|
||||
11 | baz,
|
||||
12 | ): ...
|
||||
13 | with (foo,): ...
|
||||
| ^ Syntax Error: Cannot use parentheses within a `with` statement on Python 3.8 (syntax was added in Python 3.9)
|
||||
|
|
||||
|
|
@ -0,0 +1,173 @@
|
|||
---
|
||||
source: crates/ruff_python_parser/tests/fixtures.rs
|
||||
input_file: crates/ruff_python_parser/resources/inline/ok/parenthesized_context_manager_py39.py
|
||||
---
|
||||
## AST
|
||||
|
||||
```
|
||||
Module(
|
||||
ModModule {
|
||||
range: 0..126,
|
||||
body: [
|
||||
With(
|
||||
StmtWith {
|
||||
range: 43..73,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 49..57,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 49..52,
|
||||
id: Name("foo"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: Some(
|
||||
Name(
|
||||
ExprName {
|
||||
range: 56..57,
|
||||
id: Name("x"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
),
|
||||
},
|
||||
WithItem {
|
||||
range: 59..67,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 59..62,
|
||||
id: Name("bar"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: Some(
|
||||
Name(
|
||||
ExprName {
|
||||
range: 66..67,
|
||||
id: Name("y"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
),
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 70..73,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 70..73,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
With(
|
||||
StmtWith {
|
||||
range: 74..99,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 80..83,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 80..83,
|
||||
id: Name("foo"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
WithItem {
|
||||
range: 85..93,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 85..88,
|
||||
id: Name("bar"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: Some(
|
||||
Name(
|
||||
ExprName {
|
||||
range: 92..93,
|
||||
id: Name("y"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
),
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 96..99,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 96..99,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
With(
|
||||
StmtWith {
|
||||
range: 100..125,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 106..114,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 106..109,
|
||||
id: Name("foo"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: Some(
|
||||
Name(
|
||||
ExprName {
|
||||
range: 113..114,
|
||||
id: Name("x"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
),
|
||||
},
|
||||
WithItem {
|
||||
range: 116..119,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 116..119,
|
||||
id: Name("bar"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 122..125,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 122..125,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
)
|
||||
```
|
||||
|
|
@ -0,0 +1,77 @@
|
|||
---
|
||||
source: crates/ruff_python_parser/tests/fixtures.rs
|
||||
input_file: crates/ruff_python_parser/resources/inline/ok/tuple_context_manager_py38.py
|
||||
---
|
||||
## AST
|
||||
|
||||
```
|
||||
Module(
|
||||
ModModule {
|
||||
range: 0..85,
|
||||
body: [
|
||||
With(
|
||||
StmtWith {
|
||||
range: 43..84,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 48..79,
|
||||
context_expr: Tuple(
|
||||
ExprTuple {
|
||||
range: 48..72,
|
||||
elts: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 52..55,
|
||||
id: Name("foo"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Name(
|
||||
ExprName {
|
||||
range: 59..62,
|
||||
id: Name("bar"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Name(
|
||||
ExprName {
|
||||
range: 66..69,
|
||||
id: Name("baz"),
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
parenthesized: true,
|
||||
},
|
||||
),
|
||||
optional_vars: Some(
|
||||
Name(
|
||||
ExprName {
|
||||
range: 76..79,
|
||||
id: Name("tup"),
|
||||
ctx: Store,
|
||||
},
|
||||
),
|
||||
),
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 81..84,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 81..84,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
)
|
||||
```
|
||||
Loading…
Add table
Add a link
Reference in a new issue