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https://github.com/carbon-language/carbon-lang.git
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Chandler Carruth
2c9739799b
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
38 lines
1.5 KiB
Plaintext
38 lines
1.5 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/convert.carbon
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//
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// AUTOUPDATE
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// TIP: To test this file alone, run:
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// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/impl/lookup/import_error.carbon
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// TIP: To dump output, run:
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// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/lookup/import_error.carbon
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// --- fail_error_interface_z.carbon
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library "[[@TEST_NAME]]";
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interface Z {
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let X: type;
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}
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// The value of .X is an error.
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// CHECK:STDERR: fail_error_interface_z.carbon:[[@LINE+2]]:34-60: error: associated constant `.(Z.X)` given two different values `{}` and `()` [AssociatedConstantWithDifferentValues]
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// CHECK:STDERR:
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final impl forall [T: type] T as Z where .X = {} and .X = () {}
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// --- fail_import_error.carbon
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library "[[@TEST_NAME]]";
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import library "error_interface_z";
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fn F[unused U: type](generic T: Z) {
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// The value of `.X` is an error. It should not crash though.
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//
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// CHECK:STDERR: fail_import_error.carbon:[[@LINE+3]]:23-24: error: cannot implicitly convert expression of type `()` to `T.(Z.X)` [ConversionFailure]
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// CHECK:STDERR: fail_import_error.carbon:[[@LINE+2]]:23-24: note: type `()` does not implement interface `Core.ImplicitAs(T.(Z.X))` [MissingImplInMemberAccessInContext]
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// CHECK:STDERR:
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let unused a: T.X = ();
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}
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