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carbon-lang/toolchain/check/testdata/struct/fail_nested_incomplete.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
//
// INCLUDE-FILE: toolchain/testing/testdata/min_prelude/none.carbon
// TODO: Add ranges and switch to "--dump-sem-ir-ranges=only".
// EXTRA-ARGS: --dump-sem-ir-ranges=if-present
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/struct/fail_nested_incomplete.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/struct/fail_nested_incomplete.carbon
class Incomplete;
// CHECK:STDERR: fail_nested_incomplete.carbon:[[@LINE+3]]:8-23: error: binding pattern has incomplete type `{.a: Incomplete}` in name binding declaration [IncompleteTypeInBindingDecl]
// CHECK:STDERR: fail_nested_incomplete.carbon:[[@LINE-3]]:1-17: note: class was forward declared here [ClassForwardDeclaredHere]
// CHECK:STDERR:
var s: {.a: Incomplete};
var p: Incomplete* = &s.a;
// CHECK:STDOUT: --- fail_nested_incomplete.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %Incomplete: type = class_type @Incomplete [concrete]
// CHECK:STDOUT: %struct_type.a: type = struct_type {.a: %Incomplete} [concrete]
// CHECK:STDOUT: %ptr: type = ptr_type %Incomplete [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %ptr [concrete]
// CHECK:STDOUT: %p.patt: %pattern_type = ref_binding_pattern p [concrete]
// CHECK:STDOUT: %p.var_patt: %pattern_type = var_pattern %p.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Incomplete = %Incomplete.decl
// CHECK:STDOUT: .s = %s
// CHECK:STDOUT: .p = %p
// CHECK:STDOUT: }
// CHECK:STDOUT: %Incomplete.decl: type = class_decl @Incomplete [concrete = constants.%Incomplete] {} {}
// CHECK:STDOUT: %s.var: ref <error> = var_storage %s.var_patt [concrete = <error>]
// CHECK:STDOUT: %.loc20: type = splice_block %struct_type.a [concrete = constants.%struct_type.a] {
// CHECK:STDOUT: %Incomplete.ref.loc20: type = name_ref Incomplete, %Incomplete.decl [concrete = constants.%Incomplete]
// CHECK:STDOUT: %struct_type.a: type = struct_type {.a: %Incomplete} [concrete = constants.%struct_type.a]
// CHECK:STDOUT: }
// CHECK:STDOUT: %s: <error> = wrapper_binding s, <error> [concrete = <error>]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %s.patt: <error> = ref_binding_pattern s [concrete = <error>]
// CHECK:STDOUT: %s.var_patt: <error> = var_pattern %s.patt [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT: %p.var: ref %ptr = var_storage %p.var_patt [concrete]
// CHECK:STDOUT: %.loc22: type = splice_block %ptr [concrete = constants.%ptr] {
// CHECK:STDOUT: %Incomplete.ref.loc22: type = name_ref Incomplete, %Incomplete.decl [concrete = constants.%Incomplete]
// CHECK:STDOUT: %ptr: type = ptr_type %Incomplete.ref.loc22 [concrete = constants.%ptr]
// CHECK:STDOUT: }
// CHECK:STDOUT: %p: ref %ptr = wrapper_binding p, %p.var [concrete = %p.var]
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %p.patt: %pattern_type = ref_binding_pattern p [concrete = constants.%p.patt]
// CHECK:STDOUT: %p.var_patt: %pattern_type = var_pattern %p.patt [concrete = constants.%p.var_patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Incomplete;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: assign file.%s.var, <error>
// CHECK:STDOUT: %s.ref: <error> = name_ref s, file.%s [concrete = <error>]
// CHECK:STDOUT: %a.ref: <error> = name_ref a, <error> [concrete = <error>]
// CHECK:STDOUT: %addr: <error> = addr_of %a.ref [concrete = <error>]
// CHECK:STDOUT: assign file.%p.var, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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