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---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/invalid/expressions/lambda_default_parameters.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..20,
body: [
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 0..20,
value: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 0..20,
parameters: Some(
Parameters {
range: 7..17,
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,
},
default: None,
},
ParameterWithDefault {
range: 10..14,
node_index: NodeIndex(None),
parameter: Parameter {
range: 10..11,
node_index: NodeIndex(None),
name: Identifier {
id: Name("b"),
range: 10..11,
node_index: NodeIndex(None),
},
annotation: None,
},
default: Some(
NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 12..14,
value: Int(
20,
),
},
),
),
},
ParameterWithDefault {
range: 16..17,
node_index: NodeIndex(None),
parameter: Parameter {
range: 16..17,
node_index: NodeIndex(None),
name: Identifier {
id: Name("c"),
range: 16..17,
node_index: NodeIndex(None),
},
annotation: None,
},
default: None,
},
],
vararg: None,
kwonlyargs: [],
kwarg: None,
},
),
body: NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 19..20,
value: Int(
1,
),
},
),
},
),
},
),
],
},
)
```
## Errors
|
1 | lambda a, b=20, c: 1
| ^ Syntax Error: Parameter without a default cannot follow a parameter with a default
|