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carbon-lang/toolchain/parse/testdata/where_expr/fail_rewrite.carbon
T
Lucile Rose Nihlen 2952ec9c10 Fix a crash when checking a nested tuple-pattern (#7716) 
Adds a virtual node to `DefaultValuePattern` to end the
`ExprRegionForPattern` before checking the expression
for the default value.

When checking the default value expression, the context
was still configured to interpret expressions as patterns,
which caused some corruption of state with tuple-pattern
subpatterns.

Corrects an assertion failure I found while working on
feedback from #7665.
2026-09-04 01:22:16 +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/where_expr/fail_rewrite.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/parse/testdata/where_expr/fail_rewrite.carbon
// Tests for reporting errors when a rewrite requirement doesn't follow
// `where .designator = rewrite`.
// --- fail_not_designator.carbon
// CHECK:STDERR: fail_not_designator.carbon:[[@LINE+4]]:44: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn NotDesignator(generic T: type where i32 = .U);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn NotDesignator(generic T: type where i32 = .U);
// --- fail_designator_in_parens.carbon
// CHECK:STDERR: fail_designator_in_parens.carbon:[[@LINE+4]]:47: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn DesignatorInParens(generic V: I where (.J) = bool);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn DesignatorInParens(generic V: I where (.J) = bool);
// --- fail_dot_self.carbon
// CHECK:STDERR: fail_dot_self.carbon:[[@LINE+4]]:37: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn DotSelf(generic W: K where .Self = f32);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn DotSelf(generic W: K where .Self = f32);
// --- fail_dot_keyword.carbon
// CHECK:STDERR: fail_dot_keyword.carbon:[[@LINE+4]]:35: error: expected identifier or `Self` after `.` [ExpectedIdentifierOrSelfAfterPeriod]
// CHECK:STDERR: fn DotKeyword(generic W: K where .and = u8);
// CHECK:STDERR: ^~~
// CHECK:STDERR:
fn DotKeyword(generic W: K where .and = u8);
// --- fail_postfix_after_designator.carbon
// CHECK:STDERR: fail_postfix_after_designator.carbon:[[@LINE+4]]:50: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn PostfixAfterDesignator(generic X: L where .M* = u64*);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn PostfixAfterDesignator(generic X: L where .M* = u64*);
// --- fail_binary_op_after_designator.carbon
// CHECK:STDERR: fail_binary_op_after_designator.carbon:[[@LINE+4]]:55: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn BinaryOpAfterDesignator(generic Y: N where .O + .P = {});
// CHECK:STDERR: ^
// CHECK:STDERR:
fn BinaryOpAfterDesignator(generic Y: N where .O + .P = {});
// --- fail_after_and.carbon
// CHECK:STDERR: fail_after_and.carbon:[[@LINE+4]]:50: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR: fn AfterAnd(generic Z: Q where .R impls S and () = .A);
// CHECK:STDERR: ^
// CHECK:STDERR:
fn AfterAnd(generic Z: Q where .R impls S and () = .A);
// CHECK:STDOUT: - filename: fail_not_designator.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'NotDesignator'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'T'
// CHECK:STDOUT: │ │ │ ├─CompileTimeBindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─TypeTypeLiteral 'type'
// CHECK:STDOUT: │ │ │ │ ╭─WhereOperand 'where'
// CHECK:STDOUT: │ │ │ │ ├─IntTypeLiteral 'i32'
// CHECK:STDOUT: │ │ │ ├─WhereExpr 'where' has_error
// CHECK:STDOUT: │ │ │ ╭─CompileTimeBindingPattern ':' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'U'
// CHECK:STDOUT: │ │ │ ├─DesignatorExpr '.'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_designator_in_parens.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'DesignatorInParens'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'V'
// CHECK:STDOUT: │ │ │ ├─CompileTimeBindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameExpr 'I'
// CHECK:STDOUT: │ │ │ │ ╭─WhereOperand 'where'
// CHECK:STDOUT: │ │ │ │ │ ╭─ParenExprStart '('
// CHECK:STDOUT: │ │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'J'
// CHECK:STDOUT: │ │ │ │ │ ├─DesignatorExpr '.'
// CHECK:STDOUT: │ │ │ │ ├─ParenExpr ')'
// CHECK:STDOUT: │ │ │ ├─WhereExpr 'where' has_error
// CHECK:STDOUT: │ │ │ ╭─CompileTimeBindingPattern ':' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ ├─BoolTypeLiteral 'bool'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_dot_self.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'DotSelf'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'W'
// CHECK:STDOUT: │ │ │ ├─CompileTimeBindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameExpr 'K'
// CHECK:STDOUT: │ │ │ │ ╭─WhereOperand 'where'
// CHECK:STDOUT: │ │ │ │ │ ╭─SelfTypeName 'Self'
// CHECK:STDOUT: │ │ │ │ ├─DesignatorExpr '.'
// CHECK:STDOUT: │ │ │ ├─WhereExpr 'where' has_error
// CHECK:STDOUT: │ │ │ ╭─CompileTimeBindingPattern ':' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ ├─FloatTypeLiteral 'f32'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_dot_keyword.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'DotKeyword'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'W'
// CHECK:STDOUT: │ │ │ ├─CompileTimeBindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameExpr 'K'
// CHECK:STDOUT: │ │ │ │ ╭─WhereOperand 'where'
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'and' has_error
// CHECK:STDOUT: │ │ │ │ ├─DesignatorExpr '.' has_error
// CHECK:STDOUT: │ │ │ ├─WhereExpr 'where' has_error
// CHECK:STDOUT: │ │ │ ╭─CompileTimeBindingPattern ':' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ ├─UnsignedIntTypeLiteral 'u8'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_postfix_after_designator.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'PostfixAfterDesignator'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'X'
// CHECK:STDOUT: │ │ │ ├─CompileTimeBindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameExpr 'L'
// CHECK:STDOUT: │ │ │ │ ╭─WhereOperand 'where'
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'M'
// CHECK:STDOUT: │ │ │ │ │ ╭─DesignatorExpr '.'
// CHECK:STDOUT: │ │ │ │ ├─PostfixOperatorStar '*'
// CHECK:STDOUT: │ │ │ ├─WhereExpr 'where' has_error
// CHECK:STDOUT: │ │ │ ╭─CompileTimeBindingPattern ':' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ │ ╭─UnsignedIntTypeLiteral 'u64'
// CHECK:STDOUT: │ │ │ ├─PostfixOperatorStar '*'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_binary_op_after_designator.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'BinaryOpAfterDesignator'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'Y'
// CHECK:STDOUT: │ │ │ ├─CompileTimeBindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameExpr 'N'
// CHECK:STDOUT: │ │ │ │ ╭─WhereOperand 'where'
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'O'
// CHECK:STDOUT: │ │ │ │ │ ╭─DesignatorExpr '.'
// CHECK:STDOUT: │ │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'P'
// CHECK:STDOUT: │ │ │ │ │ ├─DesignatorExpr '.'
// CHECK:STDOUT: │ │ │ │ ├─InfixOperatorPlus '+'
// CHECK:STDOUT: │ │ │ ├─WhereExpr 'where' has_error
// CHECK:STDOUT: │ │ │ ╭─CompileTimeBindingPattern ':' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ │ ╭─StructLiteralStart '{'
// CHECK:STDOUT: │ │ │ ├─StructLiteral '}'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
// CHECK:STDOUT: - filename: fail_after_and.carbon
// CHECK:STDOUT: ╭─FileStart ''
// CHECK:STDOUT: │ ╭─FunctionIntroducer 'fn'
// CHECK:STDOUT: │ ├─IdentifierNameMaybeBeforeSignature 'AfterAnd'
// CHECK:STDOUT: │ │ ╭─ExplicitParamListStart '('
// CHECK:STDOUT: │ │ │ ╭─IdentifierNameNotBeforeSignature 'Z'
// CHECK:STDOUT: │ │ │ ├─CompileTimeBindingPatternTypeStart ':'
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameExpr 'Q'
// CHECK:STDOUT: │ │ │ │ ╭─WhereOperand 'where'
// CHECK:STDOUT: │ │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'R'
// CHECK:STDOUT: │ │ │ │ │ ╭─DesignatorExpr '.'
// CHECK:STDOUT: │ │ │ │ │ ├─IdentifierNameExpr 'S'
// CHECK:STDOUT: │ │ │ │ ├─RequirementImpls 'impls'
// CHECK:STDOUT: │ │ │ │ ├─RequirementAnd 'and'
// CHECK:STDOUT: │ │ │ │ │ ╭─TupleLiteralStart '('
// CHECK:STDOUT: │ │ │ │ ├─TupleLiteral ')'
// CHECK:STDOUT: │ │ │ ├─WhereExpr 'where' has_error
// CHECK:STDOUT: │ │ │ ╭─CompileTimeBindingPattern ':' has_error
// CHECK:STDOUT: │ │ │ ├─DefaultValueExprStart '='
// CHECK:STDOUT: │ │ │ │ ╭─IdentifierNameNotBeforeSignature 'A'
// CHECK:STDOUT: │ │ │ ├─DesignatorExpr '.'
// CHECK:STDOUT: │ │ ├─DefaultValuePattern '=' has_error
// CHECK:STDOUT: │ ├─ExplicitParamList ')' has_error
// CHECK:STDOUT: ├─FunctionDecl ';'
// CHECK:STDOUT: ├─FileEnd ''
// CHECK:STDOUT: (root)
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