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---
source: crates/ruff_python_parser/tests/fixtures.rs
input_file: crates/ruff_python_parser/resources/inline/err/lambda_in_replacement_field.py
---
## AST
```
Module(
ModModule {
node_index: NodeIndex(None),
range: 0..48,
body: [
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 0..15,
value: FString(
ExprFString {
node_index: NodeIndex(None),
range: 0..15,
value: FStringValue {
inner: Single(
FString {
range: 0..15,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 2..12,
node_index: NodeIndex(None),
expression: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 3..12,
parameters: Some(
Parameters {
range: 10..11,
node_index: NodeIndex(None),
posonlyargs: [],
args: [
ParameterWithDefault {
range: 10..11,
node_index: NodeIndex(None),
parameter: Parameter {
range: 10..11,
node_index: NodeIndex(None),
name: Identifier {
id: Name("x"),
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: Name(
ExprName {
node_index: NodeIndex(None),
range: 12..12,
id: Name(""),
ctx: Invalid,
},
),
},
),
debug_text: None,
conversion: None,
format_spec: None,
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
Literal(
InterpolatedStringLiteralElement {
range: 12..13,
node_index: NodeIndex(None),
value: "x",
},
),
],
flags: FStringFlags {
quote_style: Double,
prefix: Regular,
triple_quoted: false,
unclosed: false,
},
},
),
},
runtime_joined_str: None,
runtime_values: None,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 16..32,
value: FString(
ExprFString {
node_index: NodeIndex(None),
range: 16..32,
value: FStringValue {
inner: Single(
FString {
range: 16..32,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 18..29,
node_index: NodeIndex(None),
expression: Tuple(
ExprTuple {
node_index: NodeIndex(None),
range: 19..29,
elts: [
NumberLiteral(
ExprNumberLiteral {
node_index: NodeIndex(None),
range: 19..20,
value: Int(
1,
),
},
),
Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 22..29,
parameters: None,
body: Name(
ExprName {
node_index: NodeIndex(None),
range: 29..29,
id: Name(""),
ctx: Invalid,
},
),
},
),
],
ctx: Load,
parenthesized: false,
runtime_elts: None,
},
),
debug_text: None,
conversion: None,
format_spec: None,
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
Literal(
InterpolatedStringLiteralElement {
range: 29..30,
node_index: NodeIndex(None),
value: "x",
},
),
],
flags: FStringFlags {
quote_style: Double,
prefix: Regular,
triple_quoted: false,
unclosed: false,
},
},
),
},
runtime_joined_str: None,
runtime_values: None,
},
),
},
),
Expr(
StmtExpr {
node_index: NodeIndex(None),
range: 33..47,
value: TString(
ExprTString {
node_index: NodeIndex(None),
range: 33..47,
value: TStringValue {
inner: Single(
TString {
range: 33..47,
node_index: NodeIndex(None),
elements: [
Interpolation(
InterpolatedElement {
range: 35..46,
node_index: NodeIndex(None),
expression: Lambda(
ExprLambda {
node_index: NodeIndex(None),
range: 36..45,
parameters: Some(
Parameters {
range: 43..44,
node_index: NodeIndex(None),
posonlyargs: [],
args: [
ParameterWithDefault {
range: 43..44,
node_index: NodeIndex(None),
parameter: Parameter {
range: 43..44,
node_index: NodeIndex(None),
name: Identifier {
id: Name("x"),
range: 43..44,
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: Name(
ExprName {
node_index: NodeIndex(None),
range: 45..45,
id: Name(""),
ctx: Invalid,
},
),
},
),
debug_text: None,
conversion: None,
format_spec: None,
runtime_str: None,
runtime_interpolation_format_spec: None,
runtime_formatted_value_format_spec: None,
},
),
],
flags: TStringFlags {
quote_style: Double,
prefix: Regular,
triple_quoted: false,
unclosed: false,
},
},
),
},
runtime_template_str: None,
runtime_values: None,
},
),
},
),
],
runtime_body: None,
},
)
```
## Errors
|
1 | f"{lambda x:x}"
| ^^^^^^^^^ Syntax Error: f-string: lambda expressions are not allowed without parentheses
2 | f"{1, lambda:x}"
3 | t"{lambda x:}"
|
|
1 | f"{lambda x:x}"
| ^ Syntax Error: invalid syntax
2 | f"{1, lambda:x}"
3 | t"{lambda x:}"
|
|
1 | f"{lambda x:x}"
| ^ Syntax Error: expected an element of or the end of the f-string
2 | f"{1, lambda:x}"
3 | t"{lambda x:}"
|
|
1 | f"{lambda x:x}"
2 | f"{1, lambda:x}"
| ^^^^^^^ Syntax Error: f-string: lambda expressions are not allowed without parentheses
3 | t"{lambda x:}"
|
|
1 | f"{lambda x:x}"
2 | f"{1, lambda:x}"
| ^ Syntax Error: invalid syntax
3 | t"{lambda x:}"
|
|
1 | f"{lambda x:x}"
2 | f"{1, lambda:x}"
| ^ Syntax Error: f-string: single '}' is not allowed
3 | t"{lambda x:}"
|
|
1 | f"{lambda x:x}"
2 | f"{1, lambda:x}"
3 | t"{lambda x:}"
| ^^^^^^^^^ Syntax Error: t-string: lambda expressions are not allowed without parentheses
|
1 | f"{lambda x:x}"
2 | f"{1, lambda:x}"
3 | t"{lambda x:}"
| ^ Syntax Error: invalid syntax