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---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/invalid/statements/match/as_pattern_4.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..187,
body: [
Match(
StmtMatch {
node_index: NodeIndex(None),
range: 0..186,
subject: Name(
ExprName {
node_index: NodeIndex(None),
range: 6..13,
id: Name("subject"),
ctx: Load,
},
),
cases: [
MatchCase {
range: 156..186,
node_index: NodeIndex(None),
pattern: MatchMapping(
PatternMatchMapping {
node_index: NodeIndex(None),
range: 161..172,
keys: [
Name(
ExprName {
node_index: NodeIndex(None),
range: 162..163,
id: Name("x"),
ctx: Store,
},
),
Name(
ExprName {
node_index: NodeIndex(None),
range: 167..168,
id: Name("y"),
ctx: Store,
},
),
],
patterns: [
MatchAs(
PatternMatchAs {
node_index: NodeIndex(None),
range: 164..166,
pattern: None,
name: Some(
Identifier {
id: Name("as"),
range: 164..166,
node_index: NodeIndex(None),
},
),
},
),
MatchValue(
PatternMatchValue {
node_index: NodeIndex(None),
range: 170..171,
value: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 170..171,
value: Int(
1,
),
},
),
},
),
],
rest: None,
runtime_keys: None,
runtime_patterns: None,
},
),
guard: None,
body: [
Pass(
StmtPass {
node_index: NodeIndex(None),
range: 182..186,
},
),
],
runtime_body: None,
},
],
},
),
],
runtime_body: None,
},
)
```
## Errors
|
2 | # This `as` pattern is unparenthesized so the parser never takes the path
3 | # where it might be confused as a mapping key pattern.
4 | case {x as y: 1}:
| ^ Syntax Error: Invalid mapping pattern key
5 | pass
|
|
2 | # This `as` pattern is unparenthesized so the parser never takes the path
3 | # where it might be confused as a mapping key pattern.
4 | case {x as y: 1}:
| ^^ Syntax Error: Expected `:`, found `as`
5 | pass
|
|
2 | # This `as` pattern is unparenthesized so the parser never takes the path
3 | # where it might be confused as a mapping key pattern.
4 | case {x as y: 1}:
| ^ Syntax Error: Expected `,`, found name
5 | pass
|