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carbon-lang/toolchain/parse/testdata/lambda/lambda.carbon
T
Geoff Romer 6429c1655c Make the tree structure more explicit in parse dumps (#7591) 
It's hard to track 2-space indent levels across large vertical gaps, and
it can be hard to suppress the instinct to read the dump as if it were
preorder. This change introduces a new dump mode that addresses both
problems by using box-drawing characters to explicitly represent the
parent-child edges of the tree. This new mode is the default, but the
old behavior remains available with
`--parse-dump-format=yaml-postorder`.
2026-07-31 16:44:18 +00:00

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// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
// Exceptions. See /LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/parse/testdata/lambda/lambda.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/lambda/lambda.carbon
// --- basic.carbon
var a: auto = fn [T: type] (x: T) -> T { return x; };
var b: auto = fn (x: i32) => x;
var c: auto = fn { };
// --- fail_unconsumed_lambda_introducer.carbon
// Tests that the compiler does not crash when a LambdaIntroducer (`fn`)
// is left unconsumed inside an invalid binary operator sequence.
// CHECK:STDERR: fail_unconsumed_lambda_introducer.carbon:[[@LINE+12]]:10: error: whitespace missing around binary operator [BinaryOperatorRequiresWhitespace]
// CHECK:STDERR: require j%-fn->>
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_unconsumed_lambda_introducer.carbon:[[@LINE+8]]:16: error: expected expression [ExpectedExpr]
// CHECK:STDERR: require j%-fn->>
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_unconsumed_lambda_introducer.carbon:[[@LINE+4]]:16: error: whitespace missing before binary operator [BinaryOperatorRequiresWhitespace]
// CHECK:STDERR: require j%-fn->>
// CHECK:STDERR: ^
// CHECK:STDERR:
require j%-fn->>
// CHECK:STDERR: fail_unconsumed_lambda_introducer.carbon:[[@LINE+12]]:1: error: expected expression [ExpectedExpr]
// CHECK:STDERR:
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_unconsumed_lambda_introducer.carbon:[[@LINE+8]]:1: error: expected `=>` or `{` after return type [ExpectedLambdaBodyAfterReturnType]
// CHECK:STDERR:
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_unconsumed_lambda_introducer.carbon:[[@LINE+4]]:1: error: expected `impls` in `require` declaration [RequireExpectedImpls]
// CHECK:STDERR:
// CHECK:STDERR: ^
// CHECK:STDERR:
// --- fail_expected_body.carbon
fn F() {
// CHECK:STDERR: fail_expected_body.carbon:[[@LINE+4]]:20: error: expected `->`, `=>`, or `{` [ExpectedLambdaBody]
// CHECK:STDERR: var x: auto = fn ;
// CHECK:STDERR: ^
// CHECK:STDERR:
var x: auto = fn ;
}
// --- fail_expected_body_after_return_type.carbon
fn G() {
// CHECK:STDERR: fail_expected_body_after_return_type.carbon:[[@LINE+4]]:27: error: expected `=>` or `{` after return type [ExpectedLambdaBodyAfterReturnType]
// CHECK:STDERR: var x: auto = fn -> i32 ;
// CHECK:STDERR: ^
// CHECK:STDERR:
var x: auto = fn -> i32 ;
}
// CHECK:STDOUT: - filename: basic.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─VariableIntroducer 'var'
// CHECK:STDOUT: │ │ ╭─IdentifierNameNotBeforeSignature 'a'
// CHECK:STDOUT: │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ ├─AutoTypeLiteral 'auto'
// CHECK:STDOUT: │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─VariableInitializer '='
// CHECK:STDOUT: │ │ ╭─LambdaIntroducer 'fn'
// CHECK:STDOUT: │ │ │ ╭─ImplicitParamListStart '['
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'T'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─TypeTypeLiteral 'type'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─ImplicitParamList ']'
// CHECK:STDOUT: │ │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IdentifierNameExpr 'T'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─ExplicitParamList ')'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameExpr 'T'
// CHECK:STDOUT: │ │ ├─ReturnType '->'
// CHECK:STDOUT: │ │ │ ╭─CodeBlockStart '{'
// CHECK:STDOUT: │ │ │ │ ╭─ReturnStatementStart 'return'
// CHECK:STDOUT: │ │ │ │ ├─IdentifierNameExpr 'x'
// CHECK:STDOUT: │ │ │ ├─ReturnStatement ';'
// CHECK:STDOUT: │ │ ├─CodeBlock '}'
// CHECK:STDOUT: │ ├─Lambda 'fn'
// CHECK:STDOUT: ├─VariableDecl ';'
// CHECK:STDOUT: │ ╭─VariableIntroducer 'var'
// CHECK:STDOUT: │ │ ╭─IdentifierNameNotBeforeSignature 'b'
// CHECK:STDOUT: │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ ├─AutoTypeLiteral 'auto'
// CHECK:STDOUT: │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─VariableInitializer '='
// CHECK:STDOUT: │ │ ╭─LambdaIntroducer 'fn'
// CHECK:STDOUT: │ │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─LetBindingPattern ':'
// CHECK:STDOUT: │ │ ├─ExplicitParamList ')'
// CHECK:STDOUT: │ │ ├─TerseBodyArrow '=>'
// CHECK:STDOUT: │ │ ├─IdentifierNameExpr 'x'
// CHECK:STDOUT: │ ├─Lambda 'fn'
// CHECK:STDOUT: ├─VariableDecl ';'
// CHECK:STDOUT: │ ╭─VariableIntroducer 'var'
// CHECK:STDOUT: │ │ ╭─IdentifierNameNotBeforeSignature 'c'
// CHECK:STDOUT: │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ ├─AutoTypeLiteral 'auto'
// CHECK:STDOUT: │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ ├─VariableInitializer '='
// CHECK:STDOUT: │ │ ╭─LambdaIntroducer 'fn'
// CHECK:STDOUT: │ │ │ ╭─CodeBlockStart '{'
// CHECK:STDOUT: │ │ ├─CodeBlock '}'
// CHECK:STDOUT: │ ├─Lambda 'fn'
// CHECK:STDOUT: ├─VariableDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_unconsumed_lambda_introducer.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─RequireIntroducer 'require'
// CHECK:STDOUT: │ │ ╭─IdentifierNameExpr 'j'
// CHECK:STDOUT: │ │ │ ╭─LambdaIntroducer 'fn'
// CHECK:STDOUT: │ │ │ │ ╭─InvalidParse '>' has_error
// CHECK:STDOUT: │ │ │ │ ├─InvalidParse '' has_error
// CHECK:STDOUT: │ │ │ │ ╭─InfixOperatorGreater '>' has_error
// CHECK:STDOUT: │ │ │ ├─ReturnType '->'
// CHECK:STDOUT: │ │ │ ├─InvalidParse '' has_error
// CHECK:STDOUT: │ │ │ ╭─Lambda 'fn' has_error
// CHECK:STDOUT: │ │ ├─PrefixOperatorMinus '-'
// CHECK:STDOUT: │ ├─InfixOperatorPercent '%'
// CHECK:STDOUT: ├─RequireDecl '>' has_error
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_expected_body.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'F'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ ├─ExplicitParamList ')'
// CHECK:STDOUT: │ ╭─FunctionDefinitionStart '{'
// CHECK:STDOUT: │ │ ╭─VariableIntroducer 'var'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─AutoTypeLiteral 'auto'
// CHECK:STDOUT: │ │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ │ ├─VariableInitializer '='
// CHECK:STDOUT: │ │ │ ╭─LambdaIntroducer 'fn'
// CHECK:STDOUT: │ │ │ ├─InvalidParse ';' has_error
// CHECK:STDOUT: │ │ ├─Lambda 'fn' has_error
// CHECK:STDOUT: │ ├─VariableDecl ';'
// CHECK:STDOUT: ├─FunctionDefinition '}'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_expected_body_after_return_type.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'G'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ ├─ExplicitParamList ')'
// CHECK:STDOUT: │ ╭─FunctionDefinitionStart '{'
// CHECK:STDOUT: │ │ ╭─VariableIntroducer 'var'
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'x'
// CHECK:STDOUT: │ │ │ ├─BindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ ├─AutoTypeLiteral 'auto'
// CHECK:STDOUT: │ │ │ ╭─VarBindingPattern ':'
// CHECK:STDOUT: │ │ ├─VariablePattern 'var'
// CHECK:STDOUT: │ │ ├─VariableInitializer '='
// CHECK:STDOUT: │ │ │ ╭─LambdaIntroducer 'fn'
// CHECK:STDOUT: │ │ │ │ ╭─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─ReturnType '->'
// CHECK:STDOUT: │ │ │ ├─InvalidParse ';' has_error
// CHECK:STDOUT: │ │ ├─Lambda 'fn' has_error
// CHECK:STDOUT: │ ├─VariableDecl ';'
// CHECK:STDOUT: ├─FunctionDefinition '}'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
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