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---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/invalid/expressions/lambda_duplicate_parameters.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..91,
body: [
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 0..14,
value: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 0..14,
parameters: Some(
Parameters {
range: 7..11,
node_index: NodeIndex(None),
posonlyargs: [],
args: [
ParameterWithDefault {
range: 7..8,
node_index: NodeIndex(None),
parameter: Parameter {
range: 7..8,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 7..8,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: None,
},
ParameterWithDefault {
range: 10..11,
node_index: NodeIndex(None),
parameter: Parameter {
range: 10..11,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 10..11,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: None,
},
],
vararg: None,
kwonlyargs: [],
kwarg: None,
runtime_defaults: None,
},
),
body: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 13..14,
value: Int(
1,
),
},
),
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 16..33,
value: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 16..33,
parameters: Some(
Parameters {
range: 23..30,
node_index: NodeIndex(None),
posonlyargs: [],
args: [
ParameterWithDefault {
range: 23..24,
node_index: NodeIndex(None),
parameter: Parameter {
range: 23..24,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 23..24,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: None,
},
],
vararg: None,
kwonlyargs: [
ParameterWithDefault {
range: 29..30,
node_index: NodeIndex(None),
parameter: Parameter {
range: 29..30,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 29..30,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: None,
},
],
kwarg: None,
runtime_defaults: None,
},
),
body: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 32..33,
value: Int(
1,
),
},
),
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 35..52,
value: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 35..52,
parameters: Some(
Parameters {
range: 42..49,
node_index: NodeIndex(None),
posonlyargs: [],
args: [
ParameterWithDefault {
range: 42..43,
node_index: NodeIndex(None),
parameter: Parameter {
range: 42..43,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 42..43,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: None,
},
ParameterWithDefault {
range: 45..49,
node_index: NodeIndex(None),
parameter: Parameter {
range: 45..46,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 45..46,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: Some(
NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 47..49,
value: Int(
20,
),
},
),
),
},
],
vararg: None,
kwonlyargs: [],
kwarg: None,
runtime_defaults: None,
},
),
body: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 51..52,
value: Int(
1,
),
},
),
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 54..69,
value: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 54..69,
parameters: Some(
Parameters {
range: 61..66,
node_index: NodeIndex(None),
posonlyargs: [],
args: [
ParameterWithDefault {
range: 61..62,
node_index: NodeIndex(None),
parameter: Parameter {
range: 61..62,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 61..62,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: None,
},
],
vararg: Some(
Parameter {
range: 64..66,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 65..66,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
),
kwonlyargs: [],
kwarg: None,
runtime_defaults: None,
},
),
body: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 68..69,
value: Int(
1,
),
},
),
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 71..90,
value: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 71..90,
parameters: Some(
Parameters {
range: 78..87,
node_index: NodeIndex(None),
posonlyargs: [],
args: [
ParameterWithDefault {
range: 78..79,
node_index: NodeIndex(None),
parameter: Parameter {
range: 78..79,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 78..79,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
default: None,
},
],
vararg: None,
kwonlyargs: [],
kwarg: Some(
Parameter {
range: 84..87,
node_index: NodeIndex(None),
name: Identifier {
id: Name("a"),
range: 86..87,
node_index: NodeIndex(None),
},
annotation: None,
runtime_type_comment: None,
runtime_type_comment_bytes: None,
},
),
runtime_defaults: None,
},
),
body: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 89..90,
value: Int(
1,
),
},
),
},
),
},
),
],
runtime_body: None,
},
)
```
## Errors
|
7 | lambda a, *a: 1
8 |
9 | lambda a, *, **a: 1
| ^^^ Syntax Error: Expected one or more keyword parameter after `*` separator
## Semantic Syntax Errors
|
1 | lambda a, a: 1
| ^ Syntax Error: Duplicate parameter "a"
2 |
3 | lambda a, *, a: 1
|
|
1 | lambda a, a: 1
2 |
3 | lambda a, *, a: 1
| ^ Syntax Error: Duplicate parameter "a"
4 |
5 | lambda a, a=20: 1
|
|
3 | lambda a, *, a: 1
4 |
5 | lambda a, a=20: 1
| ^ Syntax Error: Duplicate parameter "a"
6 |
7 | lambda a, *a: 1
|
|
5 | lambda a, a=20: 1
6 |
7 | lambda a, *a: 1
| ^ Syntax Error: Duplicate parameter "a"
8 |
9 | lambda a, *, **a: 1
|
|
7 | lambda a, *a: 1
8 |
9 | lambda a, *, **a: 1
| ^ Syntax Error: Duplicate parameter "a"