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carbon-lang/toolchain/parse/testdata/basics/form_literals.carbon
T
Geoff Romer 4a0cf6c1fb Track the start of a signature more accurately (#6760) 
This change ensures that a function signature always starts with an
`IdentifierNameMaybeBeforeSignature` node (renamed from
`IdentifierNameBeforeParams`), even in the case of function declarations
like `fn F -> T` that have no parameter list. As a consequence, this
ensures that we push new entries onto `pattern_block_stack` and
`full_pattern_stack` when we start processing the function signature.
2026-02-23 22:46:03 +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/basics/form_literals.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/basics/form_literals.carbon
// --- basics.carbon
fn F() {
form(ref i32);
form(var T(X, Y));
form(val X.Y);
}
fn VarReturn() ->? form(ref i32);
// --- fail_invalid_form_literal.carbon
fn F() {
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+4]]:7: error: expected `(` after `form` [ExpectedParenAfter]
// CHECK:STDERR: form;
// CHECK:STDERR: ^
// CHECK:STDERR:
form;
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+8]]:8: error: expected `ref`, `var`, or `val` after `form(` [ExpectedCategoryModifier]
// CHECK:STDERR: form();
// CHECK:STDERR: ^
// CHECK:STDERR:
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+4]]:8: error: expected expression [ExpectedExpr]
// CHECK:STDERR: form();
// CHECK:STDERR: ^
// CHECK:STDERR:
form();
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+4]]:8: error: expected `ref`, `var`, or `val` after `form(` [ExpectedCategoryModifier]
// CHECK:STDERR: form(i32);
// CHECK:STDERR: ^~~
// CHECK:STDERR:
form(i32);
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+8]]:8: error: expected `ref`, `var`, or `val` after `form(` [ExpectedCategoryModifier]
// CHECK:STDERR: form(whole lot of nonsense);
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+4]]:14: error: unexpected tokens before `)` [ExpectedCloseSymbol]
// CHECK:STDERR: form(whole lot of nonsense);
// CHECK:STDERR: ^~~
// CHECK:STDERR:
form(whole lot of nonsense);
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+4]]:18: error: unexpected tokens before `)` [ExpectedCloseSymbol]
// CHECK:STDERR: form(var whole lot of nonsense);
// CHECK:STDERR: ^~~
// CHECK:STDERR:
form(var whole lot of nonsense);
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+8]]:8: error: expected `(` after `form` [ExpectedParenAfter]
// CHECK:STDERR: form whole lot of nonsense;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+4]]:8: error: expected `;` after expression statement [ExpectedExprSemi]
// CHECK:STDERR: form whole lot of nonsense;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
form whole lot of nonsense;
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+8]]:8: error: expected `(` after `form` [ExpectedParenAfter]
// CHECK:STDERR: form var whole lot of nonsense;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
// CHECK:STDERR: fail_invalid_form_literal.carbon:[[@LINE+4]]:8: error: expected `;` after expression statement [ExpectedExprSemi]
// CHECK:STDERR: form var whole lot of nonsense;
// CHECK:STDERR: ^~~
// CHECK:STDERR:
form var whole lot of nonsense;
}
// CHECK:STDOUT: - filename: basics.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'F'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'RefPrimitiveForm', text: 'ref', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', subtree_size: 5},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'T'},
// CHECK:STDOUT: {kind: 'CallExprStart', text: '(', subtree_size: 2},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'X'},
// CHECK:STDOUT: {kind: 'TupleLiteralComma', text: ','},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'Y'},
// CHECK:STDOUT: {kind: 'CallExpr', text: ')', subtree_size: 6},
// CHECK:STDOUT: {kind: 'VarPrimitiveForm', text: 'var', subtree_size: 7},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', subtree_size: 10},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 11},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'X'},
// CHECK:STDOUT: {kind: 'IdentifierNameNotBeforeSignature', text: 'Y'},
// CHECK:STDOUT: {kind: 'MemberAccessExpr', text: '.', subtree_size: 3},
// CHECK:STDOUT: {kind: 'ValPrimitiveForm', text: 'val', subtree_size: 4},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', subtree_size: 7},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 8},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 31},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'VarReturn'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'RefPrimitiveForm', text: 'ref', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', subtree_size: 5},
// CHECK:STDOUT: {kind: 'ReturnForm', text: '->?', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FunctionDecl', text: ';', subtree_size: 11},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
// CHECK:STDOUT: - filename: fail_invalid_form_literal.carbon
// CHECK:STDOUT: parse_tree: [
// CHECK:STDOUT: {kind: 'FileStart', text: ''},
// CHECK:STDOUT: {kind: 'FunctionIntroducer', text: 'fn'},
// CHECK:STDOUT: {kind: 'IdentifierNameMaybeBeforeSignature', text: 'F'},
// CHECK:STDOUT: {kind: 'ExplicitParamListStart', text: '('},
// CHECK:STDOUT: {kind: 'ExplicitParamList', text: ')', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FunctionDefinitionStart', text: '{', subtree_size: 5},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: 'form', has_error: yes},
// CHECK:STDOUT: {kind: 'InvalidParse', text: 'form', has_error: yes},
// CHECK:STDOUT: {kind: 'FormLiteral', text: 'form', has_error: yes, subtree_size: 4},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 5},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'InvalidParse', text: ')', has_error: yes},
// CHECK:STDOUT: {kind: 'ValPrimitiveForm', text: 'form', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', subtree_size: 5},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IntTypeLiteral', text: 'i32'},
// CHECK:STDOUT: {kind: 'ValPrimitiveForm', text: 'form', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', subtree_size: 5},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'whole'},
// CHECK:STDOUT: {kind: 'ValPrimitiveForm', text: 'form', has_error: yes, subtree_size: 2},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: '('},
// CHECK:STDOUT: {kind: 'IdentifierNameExpr', text: 'whole'},
// CHECK:STDOUT: {kind: 'VarPrimitiveForm', text: 'var', subtree_size: 2},
// CHECK:STDOUT: {kind: 'FormLiteral', text: ')', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', subtree_size: 6},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: 'form', has_error: yes},
// CHECK:STDOUT: {kind: 'InvalidParse', text: 'form', has_error: yes},
// CHECK:STDOUT: {kind: 'FormLiteral', text: 'form', has_error: yes, subtree_size: 4},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'FormLiteralKeyword', text: 'form'},
// CHECK:STDOUT: {kind: 'FormLiteralOpenParen', text: 'form', has_error: yes},
// CHECK:STDOUT: {kind: 'InvalidParse', text: 'form', has_error: yes},
// CHECK:STDOUT: {kind: 'FormLiteral', text: 'form', has_error: yes, subtree_size: 4},
// CHECK:STDOUT: {kind: 'ExprStatement', text: ';', has_error: yes, subtree_size: 5},
// CHECK:STDOUT: {kind: 'FunctionDefinition', text: '}', subtree_size: 45},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
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