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carbon-lang/toolchain/parse/testdata/where_expr/fail_rewrite.carbon
T
Chandler Carruth 2c9739799b Render diagnostics through the terminal library (#7683) 
Diagnostic rendering was part of the data model: `Loc::FormatLocation`
and
`Loc::FormatSnippet` wrote plain text to a stream, so no capability,
color, or
terminal width could reach them.

A diagnostic is now one message with labels, contexts, and location
information
attached, and `Diagnostics::Renderer` draws it into a
`Terminal::Buffer`. The
design is in `toolchain/docs/diagnostics_rendering.md` (#7668),
authoring in
`toolchain/docs/diagnostics.md`.

Before:

```
example.carbon:6:3: error: 1 argument passed to function expecting 0 arguments
  Run0(1);
  ^~~~~~~
example.carbon:3:1: note: calling function declared here
fn Run0() {}
^~~~~~~~~~~
```

After:

```
error: 1 argument passed to function expecting 0 arguments
       ╭─┤ example.carbon:6:3
       ┆
     3 │ fn Run0() {}
       · ─────┬─────
       ·      ╰──┤ calling function declared here
       ┆
->   6 │   Run0(1);
       ·   ───────
       ╰────────────
```

`--no-diagnostic-snippets` gives a compact form, `example.carbon:6:3-9`.
File
tests use it; the rendering tests under `toolchain/diagnostics/testdata`
ask for
snippets.

C++ interop diagnostics are data now rather than text Clang drew:
`SemIR::ClangSourceLocId` names a `clang::SourceRange`, and a Clang
location is
marked as the point it names.

`StreamConsumer` moves to a `:renderer` target that `:emitter` does not
depend
on, keeping `common/terminal` out of `consumer.h`. Capabilities come
from the
file behind the error stream, so tests get plain ASCII.

`renderer_fuzzer` draws diagnostics built from fuzzer bytes with every
capability combination, since a shape the renderer doesn't expect must
never be
why the compiler dies while reporting a problem.

TODOs mark the follow-ups: line weights and crossing lines, wrapping
that keeps
a quoted type whole, and ordering diagnostics that share a byte offset.

Also: `IncorrectExtension`'s hint moves into its message, since its note
had no
location of its own, and `strip_noise` in `check_diagnostics.py` blanks
multi-line `#define`s instead of deleting them.

Assisted-by: Claude Code
2026-10-15 06:08:57 +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+2]]:44: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR:
fn NotDesignator(generic T: type where i32 = .U);
// --- fail_designator_in_parens.carbon
// CHECK:STDERR: fail_designator_in_parens.carbon:[[@LINE+2]]:47: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR:
fn DesignatorInParens(generic V: I where (.J) = bool);
// --- fail_dot_self.carbon
// CHECK:STDERR: fail_dot_self.carbon:[[@LINE+2]]:37: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR:
fn DotSelf(generic W: K where .Self = f32);
// --- fail_dot_keyword.carbon
// CHECK:STDERR: fail_dot_keyword.carbon:[[@LINE+2]]:35-37: error: expected identifier or `Self` after `.` [ExpectedIdentifierOrSelfAfterPeriod]
// CHECK:STDERR:
fn DotKeyword(generic W: K where .and = u8);
// --- fail_postfix_after_designator.carbon
// CHECK:STDERR: fail_postfix_after_designator.carbon:[[@LINE+2]]:50: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// 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+2]]:55: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// CHECK:STDERR:
fn BinaryOpAfterDesignator(generic Y: N where .O + .P = {});
// --- fail_after_and.carbon
// CHECK:STDERR: fail_after_and.carbon:[[@LINE+2]]:50: error: requirement can only use `=` after `.member` designator [RequirementEqualAfterNonDesignator]
// 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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