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carbon-lang/toolchain/check/testdata/alias/basics.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/convert.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/alias/basics.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/alias/basics.carbon
// --- alias.carbon
library "[[@TEST_NAME]]";
class C {};
//@dump-sem-ir-begin
alias c = C;
//@dump-sem-ir-end
let l: c = {};
// --- alias_of_alias.carbon
library "[[@TEST_NAME]]";
class C {}
//@dump-sem-ir-begin
alias a = C;
alias b = a;
alias c = b;
let d: c = {};
//@dump-sem-ir-end
// --- alias_to_generic.carbon
library "[[@TEST_NAME]]";
class A(T: type) {}
//@dump-sem-ir-begin
alias a = A({});
//@dump-sem-ir-end
let v: a = {} as A({});
// --- fail_control_flow.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_control_flow.carbon:[[@LINE+4]]:11-17: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR:
// CHECK:STDERR: fail_control_flow.carbon:[[@LINE+2]]:11-23: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR:
alias a = true or false;
// --- fail_name_conflict.carbon
library "[[@TEST_NAME]]";
class C {}
alias a = C;
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE+3]]:5: error: duplicate name `a` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE-2]]:7: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR:
var a: C = {};
var b: C = {};
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE+3]]:7: error: duplicate name `b` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE-2]]:5-8: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR:
alias b = C;
// --- fail_not_constant.carbon
library "[[@TEST_NAME]]";
var a: () = ();
var b: ()* = &a;
// CHECK:STDERR: fail_not_constant.carbon:[[@LINE+2]]:11-12: error: alias refers to a runtime value [AliasRequiresConstantValue]
// CHECK:STDERR:
alias c = *b;
// --- fail_params.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_params.carbon:[[@LINE+2]]:8-16: error: `alias` declaration cannot have parameters [UnexpectedDeclNameParams]
// CHECK:STDERR:
alias A(T: type) = T*;
// --- fail_modifiers.carbon
library "[[@TEST_NAME]]";
class Class {}
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+11]]:10-13: error: `base` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+10]]:1-8: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+8]]:15-21: error: `default` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+7]]:1-8: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+5]]:23-27: error: `final` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+4]]:1-8: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+2]]:1-8: error: `abstract` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR:
abstract base default final alias A = Class;
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+2]]:1-4: error: `impl` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR:
impl alias B = Class;
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+2]]:1-6: error: `extern` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR:
extern alias C = Class;
// CHECK:STDOUT: --- alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
// CHECK:STDOUT: %c: type = alias_binding c, %C.ref [concrete = constants.%C]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- alias_of_alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %C [concrete]
// CHECK:STDOUT: %d.patt: %pattern_type = value_binding_pattern d [concrete]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: %C.val: %C = struct_value () [concrete]
// CHECK:STDOUT: %.115: ref %C = temporary invalid, %C.val [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %C.ref: type = name_ref C, %C.decl [concrete = constants.%C]
// CHECK:STDOUT: %a: type = alias_binding a, %C.ref [concrete = constants.%C]
// CHECK:STDOUT: %a.ref: type = name_ref a, %a [concrete = constants.%C]
// CHECK:STDOUT: %b: type = alias_binding b, %a.ref [concrete = constants.%C]
// CHECK:STDOUT: %b.ref: type = name_ref b, %b [concrete = constants.%C]
// CHECK:STDOUT: %c: type = alias_binding c, %b.ref [concrete = constants.%C]
// CHECK:STDOUT: %.loc10_13.1: ref %C = temporary_storage
// CHECK:STDOUT: %.loc10_13.2: init %C to %.loc10_13.1 = class_init () [concrete = constants.%C.val]
// CHECK:STDOUT: %.loc10_13.3: init %C = converted @__global_init.%.loc10, %.loc10_13.2 [concrete = constants.%C.val]
// CHECK:STDOUT: %.loc10_13.4: ref %C = temporary %.loc10_13.1, %.loc10_13.3 [concrete = constants.%.115]
// CHECK:STDOUT: %.loc10_13.5: %C = acquire_value %.loc10_13.4 [concrete = constants.%C.val]
// CHECK:STDOUT: %c.ref: type = name_ref c, %c [concrete = constants.%C]
// CHECK:STDOUT: %d: %C = wrapper_binding d, %.loc10_13.5
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %d.patt: %pattern_type = value_binding_pattern d [concrete = constants.%d.patt]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %.loc10: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- alias_to_generic.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %A.type: type = parameterized_class_name_type @A [concrete]
// CHECK:STDOUT: %A.generic: %A.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: %A.e9e: type = class_type @A, @A(%empty_struct_type) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %A.ref: %A.type = name_ref A, %A.decl [concrete = constants.%A.generic]
// CHECK:STDOUT: %.loc7_14: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc7_15: type = converted %.loc7_14, constants.%empty_struct_type [concrete = constants.%empty_struct_type]
// CHECK:STDOUT: %A: type = class_type @A, @A(constants.%empty_struct_type) [concrete = constants.%A.e9e]
// CHECK:STDOUT: %a: type = alias_binding a, %A [concrete = constants.%A.e9e]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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