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Use speculative parsing for with-items (#11770)
## Summary This PR updates the with-items parsing logic to use speculative parsing instead. ### Existing logic First, let's understand the previous logic: 1. The parser sees `(`, it doesn't know whether it's part of a parenthesized with items or a parenthesized expression 2. Consider it a parenthesized with items and perform a hand-rolled speculative parsing 3. Then, verify the assumption and if it's incorrect convert the parsed with items into an appropriate expression which becomes part of the first with item Here, in (3) there are lots of edge cases which we've to deal with: 1. Trailing comma with a single element should be [converted to the expression as is](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2140-L2153)) 2. Trailing comma with multiple elements should be [converted to a tuple expression](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2155-L2178)) 3. Limit the allowed expression based on whether it's [(1)](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2144-L2152)) or [(2)](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2157-L2171)) 4. [Consider postfix expressions](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2181-L2200)) after (3) 5. [Consider `if` expressions](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2203-L2208)) after (3) 6. [Consider binary expressions](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2210-L2228)) after (3) Consider other cases like * [Single generator expression](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2020-L2035)) * [Expecting a comma](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2122-L2130)) And, this is all possible only if we allow parsing these expressions in the [with item parsing logic](9b2cf569b2/crates/ruff_python_parser/src/parser/statement.rs (L2287-L2334)). ### Speculative parsing With #11457 merged, we can simplify this logic by changing the step (3) from above to just rewind the parser back to the `(` if our assumption (parenthesized with-items) was incorrect and then continue parsing it considering parenthesized expression. This also behaves a lot similar to what a PEG parser does which is to consider the first grammar rule and if it fails consider the second grammar rule and so on. resolves: #11639 ## Test Plan - [x] Verify the updated snapshots - [x] Run the fuzzer on around 3000 valid source code (locally)
This commit is contained in:
Dhruv Manilawala
GitHub
parent
5a5a588a72
commit
6c1fa1d440
9 changed files with 556 additions and 731 deletions
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@ -375,10 +375,10 @@ Module(
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is_async: false,
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items: [
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WithItem {
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range: 364..384,
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range: 363..384,
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context_expr: Generator(
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ExprGenerator {
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range: 364..384,
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range: 363..384,
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elt: Name(
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ExprName {
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range: 364..365,
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@ -426,7 +426,7 @@ Module(
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is_async: false,
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},
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],
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parenthesized: false,
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parenthesized: true,
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},
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),
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optional_vars: None,
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@ -459,90 +459,89 @@ Module(
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),
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With(
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StmtWith {
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range: 397..435,
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range: 397..410,
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is_async: false,
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items: [
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WithItem {
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range: 403..407,
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context_expr: Name(
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range: 402..410,
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context_expr: Tuple(
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ExprTuple {
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range: 402..410,
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elts: [
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Name(
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ExprName {
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range: 403..407,
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id: "item",
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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: 409..410,
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id: "x",
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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: true,
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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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},
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),
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For(
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StmtFor {
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range: 411..429,
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is_async: false,
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target: Name(
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ExprName {
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range: 415..416,
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id: "x",
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ctx: Store,
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},
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),
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iter: Call(
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ExprCall {
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range: 420..429,
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func: Name(
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ExprName {
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range: 403..407,
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id: "item",
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range: 420..425,
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id: "range",
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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: 409..429,
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context_expr: Generator(
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ExprGenerator {
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range: 409..429,
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elt: Name(
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ExprName {
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range: 409..410,
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id: "x",
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ctx: Load,
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arguments: Arguments {
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range: 425..429,
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args: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 426..428,
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value: Int(
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10,
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),
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},
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),
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generators: [
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Comprehension {
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range: 411..429,
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target: Name(
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ExprName {
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range: 415..416,
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id: "x",
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ctx: Store,
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},
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),
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iter: Call(
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ExprCall {
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range: 420..429,
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func: Name(
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ExprName {
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range: 420..425,
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id: "range",
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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: 425..429,
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args: [
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NumberLiteral(
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ExprNumberLiteral {
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range: 426..428,
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value: Int(
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10,
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),
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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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),
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ifs: [],
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is_async: false,
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},
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],
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parenthesized: false,
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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: 432..435,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 432..435,
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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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},
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),
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body: [],
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orelse: [],
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},
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),
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Expr(
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StmtExpr {
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range: 432..435,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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},
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With(
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@ -588,10 +587,10 @@ Module(
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is_async: false,
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items: [
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WithItem {
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range: 523..539,
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range: 522..539,
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context_expr: Generator(
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ExprGenerator {
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elt: Starred(
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ExprStarred {
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@ -626,7 +625,7 @@ Module(
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is_async: false,
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},
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],
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parenthesized: false,
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parenthesized: true,
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},
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),
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optional_vars: None,
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@ -659,88 +658,92 @@ Module(
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),
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With(
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StmtWith {
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range: 552..594,
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range: 552..567,
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is_async: false,
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items: [
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WithItem {
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range: 558..563,
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context_expr: Name(
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ExprName {
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range: 558..563,
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id: "item1",
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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: 565..581,
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context_expr: Generator(
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ExprGenerator {
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range: 565..581,
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elt: Starred(
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ExprStarred {
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range: 565..567,
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value: Name(
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ExprName {
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range: 566..567,
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id: "x",
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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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generators: [
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Comprehension {
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range: 568..581,
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target: Name(
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ExprName {
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range: 572..573,
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id: "x",
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ctx: Store,
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},
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),
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iter: Name(
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ExprName {
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range: 577..581,
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id: "iter",
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ctx: Load,
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},
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),
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ifs: [],
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is_async: false,
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range: 557..567,
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context_expr: Tuple(
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ExprTuple {
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range: 557..567,
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elts: [
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Name(
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ExprName {
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range: 558..563,
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id: "item1",
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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: 565..567,
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value: Name(
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ExprName {
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range: 566..567,
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id: "x",
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ctx: Load,
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ctx: Load,
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parenthesized: false,
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optional_vars: None,
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},
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WithItem {
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context_expr: Name(
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ExprName {
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id: "item2",
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parenthesized: true,
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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: 591..594,
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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range: 591..594,
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body: [],
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},
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),
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For(
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StmtFor {
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range: 568..588,
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is_async: false,
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target: Name(
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range: 572..573,
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id: "x",
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ctx: Store,
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),
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iter: Tuple(
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ExprTuple {
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elts: [
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Name(
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ExprName {
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range: 577..581,
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id: "iter",
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ctx: Load,
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},
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],
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Name(
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id: "item2",
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ctx: Load,
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parenthesized: false,
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body: [],
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orelse: [],
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},
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Expr(
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StmtExpr {
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value: EllipsisLiteral(
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ExprEllipsisLiteral {
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With(
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is_async: false,
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items: [
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WithItem {
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range: 750..771,
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context_expr: Generator(
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ExprGenerator {
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elt: Name(
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is_async: false,
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parenthesized: false,
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optional_vars: Some(
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2 | # These cases should raise the correct syntax error and recover properly.
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3 |
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4 | with (item1, item2),: ...
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| ^ Syntax Error: Expected an expression
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| ^ Syntax Error: Trailing comma not allowed
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5 | with (item1, item2), as f: ...
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6 | with (item1, item2), item3,: ...
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10 | with (item1, item2 := 10 as f): ...
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11 | with (x for x in range(10), item): ...
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9 | with (item := 10 as f): ...
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11 | with (x for x in range(10), item): ...
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10 | with (item1, item2 := 10 as f): ...
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11 | with (x for x in range(10), item): ...
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12 | with (item, x for x in range(10)): ...
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10 | with (item1, item2 := 10 as f): ...
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12 | with (item, x for x in range(10)): ...
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12 | with (item, x for x in range(10)): ...
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15 | with ((*item)): ...
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16 |
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18 | with (item1, *x for x in iter, item2): ...
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18 | with (item1, *x for x in iter, item2): ...
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19 | with (x as f, *y): ...
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18 | with (item1, *x for x in iter, item2): ...
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| ^^ Syntax Error: Iterable unpacking cannot be used in a comprehension
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| ^^^ Syntax Error: Expected ',', found 'for'
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18 | with (item1, *x for x in iter, item2): ...
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19 | with (x as f, *y): ...
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18 | with (item1, *x for x in iter, item2): ...
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24 | with (x as f, y) as f: ...
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25 | with (x for x in iter as y): ...
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| ^^^^^^^^^^^^^^^ Syntax Error: Unparenthesized generator expression cannot be used here
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| ^^ Syntax Error: Expected ')', found 'as'
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26 |
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27 | # The inner `(...)` is parsed as parenthesized expression
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|
|
||||
23 | with (x, yield from y): ...
|
||||
24 | with (x as f, y) as f: ...
|
||||
25 | with (x for x in iter as y): ...
|
||||
| ^ Syntax Error: Expected ',', found ')'
|
||||
26 |
|
||||
27 | # The inner `(...)` is parsed as parenthesized expression
|
||||
|
|
||||
|
|
|
|||
|
|
@ -15,7 +15,7 @@ Module(
|
|||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 6..6,
|
||||
range: 5..6,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 6..6,
|
||||
|
|
@ -25,32 +25,34 @@ Module(
|
|||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
WithItem {
|
||||
range: 9..14,
|
||||
context_expr: BinOp(
|
||||
ExprBinOp {
|
||||
range: 9..14,
|
||||
left: Name(
|
||||
ExprName {
|
||||
range: 9..10,
|
||||
id: "x",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
op: Add,
|
||||
right: Name(
|
||||
ExprName {
|
||||
range: 13..14,
|
||||
id: "y",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
],
|
||||
body: [],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 9..14,
|
||||
value: BinOp(
|
||||
ExprBinOp {
|
||||
range: 9..14,
|
||||
left: Name(
|
||||
ExprName {
|
||||
range: 9..10,
|
||||
id: "x",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
op: Add,
|
||||
right: Name(
|
||||
ExprName {
|
||||
range: 13..14,
|
||||
id: "y",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
],
|
||||
|
|
|
|||
|
|
@ -15,7 +15,7 @@ Module(
|
|||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 6..6,
|
||||
range: 5..6,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 6..6,
|
||||
|
|
|
|||
|
|
@ -0,0 +1,60 @@
|
|||
---
|
||||
source: crates/ruff_python_parser/tests/fixtures.rs
|
||||
input_file: crates/ruff_python_parser/resources/inline/err/with_items_parenthesized_missing_colon.py
|
||||
---
|
||||
## AST
|
||||
|
||||
```
|
||||
Module(
|
||||
ModModule {
|
||||
range: 0..57,
|
||||
body: [
|
||||
With(
|
||||
StmtWith {
|
||||
range: 28..56,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 34..39,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 34..39,
|
||||
id: "item1",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
WithItem {
|
||||
range: 41..46,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 41..46,
|
||||
id: "item2",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
],
|
||||
body: [
|
||||
Pass(
|
||||
StmtPass {
|
||||
range: 52..56,
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
)
|
||||
```
|
||||
## Errors
|
||||
|
||||
|
|
||||
1 | # `)` followed by a newline
|
||||
2 | with (item1, item2)
|
||||
| ^ Syntax Error: Expected ':', found newline
|
||||
3 | pass
|
||||
|
|
||||
|
|
@ -239,42 +239,49 @@ Module(
|
|||
),
|
||||
With(
|
||||
StmtWith {
|
||||
range: 136..160,
|
||||
range: 136..159,
|
||||
is_async: false,
|
||||
items: [
|
||||
WithItem {
|
||||
range: 142..147,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 142..147,
|
||||
id: "item1",
|
||||
range: 141..154,
|
||||
context_expr: Tuple(
|
||||
ExprTuple {
|
||||
range: 141..154,
|
||||
elts: [
|
||||
Name(
|
||||
ExprName {
|
||||
range: 142..147,
|
||||
id: "item1",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
Name(
|
||||
ExprName {
|
||||
range: 149..154,
|
||||
id: "item2",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
],
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
WithItem {
|
||||
range: 149..154,
|
||||
context_expr: Name(
|
||||
ExprName {
|
||||
range: 149..154,
|
||||
id: "item2",
|
||||
ctx: Load,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
WithItem {
|
||||
range: 156..159,
|
||||
context_expr: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 156..159,
|
||||
parenthesized: true,
|
||||
},
|
||||
),
|
||||
optional_vars: None,
|
||||
},
|
||||
],
|
||||
body: [],
|
||||
body: [
|
||||
Expr(
|
||||
StmtExpr {
|
||||
range: 156..159,
|
||||
value: EllipsisLiteral(
|
||||
ExprEllipsisLiteral {
|
||||
range: 156..159,
|
||||
},
|
||||
),
|
||||
},
|
||||
),
|
||||
],
|
||||
},
|
||||
),
|
||||
],
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue