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carbon-lang/toolchain/check/testdata/function/declaration/fail_todo_no_params.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/function/declaration/fail_todo_no_params.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/declaration/fail_todo_no_params.carbon
// --- fail_no_body.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_no_body.carbon:[[@LINE+2]]:1-5: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR:
fn A;
// --- fail_todo_brace_body.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_todo_brace_body.carbon:[[@LINE+2]]:1-6: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR:
fn A {
}
// --- fail_todo_return_type.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_todo_return_type.carbon:[[@LINE+2]]:1-11: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR:
fn A -> ();
// --- fail_todo_implicit_only.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_todo_implicit_only.carbon:[[@LINE+2]]:1-13: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR:
fn A[] -> ();
// --- fail_todo_arrow_body.carbon
// TODO: We don't have parsing support for this yet.
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_todo_arrow_body.carbon:[[@LINE+4]]:1-7: error: semantics TODO: `function with positional parameters` [SemanticsTodo]
// CHECK:STDERR:
// CHECK:STDERR: fail_todo_arrow_body.carbon:[[@LINE+2]]:1-10: error: semantics TODO: `HandleFunctionTerseDefinition` [SemanticsTodo]
// CHECK:STDERR:
fn A => 0;
// --- fail_invalid_file_generic_regression_test.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_invalid_file_generic_regression_test.carbon:[[@LINE+4]]:13-17: error: semantics TODO: `handle invalid parse trees in `check`` [SemanticsTodo]
// CHECK:STDERR:
// CHECK:STDERR: fail_invalid_file_generic_regression_test.carbon:[[@LINE+2]]:19: error: found generic binding inside `var` pattern [NonRegularBindingInVarDecl]
// CHECK:STDERR:
var generic x: () = ();
fn A {
A();
}
// CHECK:STDOUT: --- fail_no_body.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %A.type: type = fn_type @A [concrete]
// CHECK:STDOUT: %A: %A.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: %A.type = fn_decl @A [concrete = constants.%A] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A;
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_brace_body.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %A.type: type = fn_type @A [concrete]
// CHECK:STDOUT: %A: %A.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: %A.type = fn_decl @A [concrete = constants.%A] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_return_type.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.262: Core.Form = init_form %empty_tuple.type [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %empty_tuple.type [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type = return_slot_pattern %return.param_patt, %empty_tuple.type [concrete]
// CHECK:STDOUT: %A.type: type = fn_type @A [concrete]
// CHECK:STDOUT: %A: %A.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: %A.type = fn_decl @A [concrete = constants.%A] {
// CHECK:STDOUT: %return.param_patt: %pattern_type = out_param_pattern [concrete = constants.%return.param_patt]
// CHECK:STDOUT: %return.patt: %pattern_type = return_slot_pattern %return.param_patt, %.loc5_10.2 [concrete = constants.%return.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc5_10.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc5_10.2: type = converted %.loc5_10.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc5_10.3: Core.Form = init_form %.loc5_10.2 [concrete = constants.%.262]
// CHECK:STDOUT: %return.param: ref %empty_tuple.type = out_param call_param0
// CHECK:STDOUT: %return: ref %empty_tuple.type = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() -> out %return.param: %empty_tuple.type;
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_implicit_only.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.262: Core.Form = init_form %empty_tuple.type [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %empty_tuple.type [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type = return_slot_pattern %return.param_patt, %empty_tuple.type [concrete]
// CHECK:STDOUT: %A.type: type = fn_type @A [concrete]
// CHECK:STDOUT: %A: %A.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: %A.type = fn_decl @A [concrete = constants.%A] {
// CHECK:STDOUT: %return.param_patt: %pattern_type = out_param_pattern [concrete = constants.%return.param_patt]
// CHECK:STDOUT: %return.patt: %pattern_type = return_slot_pattern %return.param_patt, %.loc5_12.2 [concrete = constants.%return.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc5_12.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc5_12.2: type = converted %.loc5_12.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc5_12.3: Core.Form = init_form %.loc5_12.2 [concrete = constants.%.262]
// CHECK:STDOUT: %return.param: ref %empty_tuple.type = out_param call_param0
// CHECK:STDOUT: %return: ref %empty_tuple.type = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A() -> out %return.param: %empty_tuple.type;
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_todo_arrow_body.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A;
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_invalid_file_generic_regression_test.carbon
// CHECK:STDOUT:
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