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carbon-lang/toolchain/check/testdata/alias/basics.carbon
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Dana Jansens fcae9610bd Make SemIR::TypeType be an empty FacetType instruction (#7813) 
The type `type` is now a `FacetType` inst with no constraints. This
brings the model implemented in the toolchain into better alignment with
the language design. The `SemIR::TypeType` struct remains as a scope for
holding the `TypeInstId`, `ConstantId`, and `TypeId` constants, but is
not an `InstKind` anymore.

The `TypeType` inst looks a lot like singletons, but there are many
`FacetType` insts so it doesn't quite fit that model. So we put it
alongside singletons with a fixed inst id but refer to it as a more
general "builtin" inst that is not a singleton.
`Namespace::PackageInstId` is similar, and we group it with `TypeType`
conceptually as another builtin instruction with a fixed id.

No conversion is needed anymore to use a `type` as a facet, since types
also have a `FacetType` type. This simplifies and removes a number of
helpers and branches throughout the code.

The `TypeType` inst is now part of the constant store, so we end up
printing it in the constants block in every test. But it's also named
`type` rather than `%type` to preserve the majority of existing
formatting behaviour, though this does look different from other
constants.

Assisted-by: Opus 5 was used to generate a first draft and validate the
refactoring. Though nearly everything non-trivial the tool wrote has
been modified or rewritten.
2026-09-22 15:04:40 +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+8]]:11: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: alias a = true or false;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_control_flow.carbon:[[@LINE+4]]:11: error: semantics TODO: `Control flow expressions are currently only supported inside functions.` [SemanticsTodo]
// CHECK:STDERR: alias a = true or false;
// CHECK:STDERR: ^~~~~~~~~~~~~
// 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+7]]:5: error: duplicate name `a` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: var a: C = {};
// CHECK:STDERR: ^
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE-4]]:7: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: alias a = C;
// CHECK:STDERR: ^
// CHECK:STDERR:
var a: C = {};
var b: C = {};
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE+7]]:7: error: duplicate name `b` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: alias b = C;
// CHECK:STDERR: ^
// CHECK:STDERR: fail_name_conflict.carbon:[[@LINE-4]]:5: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: var b: C = {};
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
alias b = C;
// --- fail_not_constant.carbon
library "[[@TEST_NAME]]";
var a: () = ();
var b: ()* = &a;
// CHECK:STDERR: fail_not_constant.carbon:[[@LINE+4]]:11: error: alias refers to a runtime value [AliasRequiresConstantValue]
// CHECK:STDERR: alias c = *b;
// CHECK:STDERR: ^~
// CHECK:STDERR:
alias c = *b;
// --- fail_params.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_params.carbon:[[@LINE+4]]:8: error: `alias` declaration cannot have parameters [UnexpectedDeclNameParams]
// CHECK:STDERR: alias A(T: type) = T*;
// CHECK:STDERR: ^~~~~~~~~
// CHECK:STDERR:
alias A(T: type) = T*;
// --- fail_modifiers.carbon
library "[[@TEST_NAME]]";
class Class {}
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+25]]:10: error: `base` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+22]]:1: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+18]]:15: error: `default` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+15]]:1: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+11]]:23: error: `final` not allowed on declaration with `abstract` [ModifierNotAllowedWith]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+8]]:1: note: `abstract` previously appeared here [ModifierPrevious]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+4]]:1: error: `abstract` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: abstract base default final alias A = Class;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR:
abstract base default final alias A = Class;
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+4]]:1: error: `impl` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: impl alias B = Class;
// CHECK:STDERR: ^~~~
// CHECK:STDERR:
impl alias B = Class;
// CHECK:STDERR: fail_modifiers.carbon:[[@LINE+4]]:1: error: `extern` not allowed on `alias` declaration [ModifierNotAllowedOnDeclaration]
// CHECK:STDERR: extern alias C = Class;
// CHECK:STDERR: ^~~~~~
// 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 = generic_class_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.940: 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.940]
// CHECK:STDOUT: %a: type = alias_binding a, %A [concrete = constants.%A.940]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: }
// CHECK:STDOUT:
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