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carbon-lang/toolchain/check/testdata/impl/lookup/alias.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/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/impl/lookup/alias.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/lookup/alias.carbon
interface HasF {
fn F();
}
class C {
alias G = HasF.F;
}
impl C as HasF {
fn F() {}
}
fn G(c: C) {
C.G();
c.G();
}
// CHECK:STDOUT: --- alias.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %HasF.type: type = facet_type <@HasF> [concrete]
// CHECK:STDOUT: %Self: %HasF.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %HasF.WithSelf.F.type.a73: type = fn_type @HasF.WithSelf.F, @HasF.WithSelf(%Self) [symbolic]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %HasF.WithSelf.F.851: %HasF.WithSelf.F.type.a73 = struct_value () [symbolic]
// CHECK:STDOUT: %HasF.assoc_type: type = assoc_entity_type @HasF [concrete]
// CHECK:STDOUT: %assoc0: %HasF.assoc_type = assoc_entity element0, @HasF.WithSelf.%HasF.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: %.ba1: <witness> = impl_self_witness %C, @HasF [concrete]
// CHECK:STDOUT: %HasF.impl_witness: <witness> = impl_witness @C.as.HasF.impl.%HasF.impl_witness_table [concrete]
// CHECK:STDOUT: %C.as.HasF.impl.F.type: type = fn_type @C.as.HasF.impl.F [concrete]
// CHECK:STDOUT: %C.as.HasF.impl.F: %C.as.HasF.impl.F.type = struct_value () [concrete]
// CHECK:STDOUT: %HasF.facet: %HasF.type = facet_value %C, (%HasF.impl_witness) [concrete]
// CHECK:STDOUT: %HasF.WithSelf.F.type.722: type = fn_type @HasF.WithSelf.F, @HasF.WithSelf(%HasF.facet) [concrete]
// CHECK:STDOUT: %HasF.WithSelf.F.689: %HasF.WithSelf.F.type.722 = struct_value () [concrete]
// CHECK:STDOUT: %pattern_type: type = pattern_type %C [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %c.patt: %pattern_type = wrapper_binding_pattern c, %c.param_patt [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %.697: type = fn_type_with_self_type %HasF.WithSelf.F.type.722, %HasF.facet [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .HasF = %HasF.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %HasF.decl: type = interface_decl @HasF [concrete = constants.%HasF.type] {} {}
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: impl_decl @C.as.HasF.impl [concrete] {} {
// CHECK:STDOUT: %C.ref: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %HasF.ref: type = name_ref HasF, file.%HasF.decl [concrete = constants.%HasF.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %.loc23: <witness> = impl_self_witness @C.as.HasF.impl.%C.ref, @HasF [concrete = constants.%.ba1]
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %c.param_patt: %pattern_type = value_param_pattern [concrete = constants.%c.param_patt]
// CHECK:STDOUT: %c.patt: %pattern_type = wrapper_binding_pattern c, %c.param_patt [concrete = constants.%c.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %c.param: %C = value_param call_param0
// CHECK:STDOUT: %C.ref.loc27: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %c: %C = wrapper_binding c, %c.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @HasF {
// CHECK:STDOUT: %Self: %HasF.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %HasF.WithSelf.decl = interface_with_self_decl @HasF [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %HasF.WithSelf.F.decl: @HasF.WithSelf.%HasF.WithSelf.F.type (%HasF.WithSelf.F.type.a73) = fn_decl @HasF.WithSelf.F [symbolic = @HasF.WithSelf.%HasF.WithSelf.F (constants.%HasF.WithSelf.F.851)] {} {}
// CHECK:STDOUT: %assoc0: %HasF.assoc_type = assoc_entity element0, %HasF.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .F = @HasF.WithSelf.%assoc0
// CHECK:STDOUT: witness = (@HasF.WithSelf.%HasF.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.HasF.impl: %C.ref as %HasF.ref {
// CHECK:STDOUT: %C.as.HasF.impl.F.decl: %C.as.HasF.impl.F.type = fn_decl @C.as.HasF.impl.F [concrete = constants.%C.as.HasF.impl.F] {} {}
// CHECK:STDOUT: %HasF.impl_witness_table = impl_witness_table (%C.as.HasF.impl.F.decl), @C.as.HasF.impl [concrete]
// CHECK:STDOUT: %HasF.impl_witness: <witness> = impl_witness %HasF.impl_witness_table [concrete = constants.%HasF.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %C.as.HasF.impl.F.decl
// CHECK:STDOUT: extend %HasF.ref
// CHECK:STDOUT: witness = %HasF.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: %HasF.ref: type = name_ref HasF, file.%HasF.decl [concrete = constants.%HasF.type]
// CHECK:STDOUT: %F.ref: %HasF.assoc_type = name_ref F, @HasF.WithSelf.%assoc0 [concrete = constants.%assoc0]
// CHECK:STDOUT: %G: %HasF.assoc_type = alias_binding G, %F.ref [concrete = constants.%assoc0]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness constants.%empty_struct_type [concrete = constants.%complete_type]
// CHECK:STDOUT: complete_type_witness = %complete_type
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = constants.%C
// CHECK:STDOUT: .HasF = <poisoned>
// CHECK:STDOUT: .G = %G
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @HasF.WithSelf.F(@HasF.%Self: %HasF.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.as.HasF.impl.F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%c.param: %C) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %C.ref.loc28: type = name_ref C, file.%C.decl [concrete = constants.%C]
// CHECK:STDOUT: %G.ref.loc28: %HasF.assoc_type = name_ref G, @C.%G [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc28: %.697 = impl_witness_access constants.%HasF.impl_witness, element0 [concrete = constants.%C.as.HasF.impl.F]
// CHECK:STDOUT: %C.as.HasF.impl.F.call.loc28: init %empty_tuple.type = call %impl.elem0.loc28()
// CHECK:STDOUT: %c.ref: %C = name_ref c, %c
// CHECK:STDOUT: %G.ref.loc29: %HasF.assoc_type = name_ref G, @C.%G [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc29: %.697 = impl_witness_access constants.%HasF.impl_witness, element0 [concrete = constants.%C.as.HasF.impl.F]
// CHECK:STDOUT: %C.as.HasF.impl.F.call.loc29: init %empty_tuple.type = call %impl.elem0.loc29()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @HasF.WithSelf(constants.%Self) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %HasF.WithSelf.F.type => constants.%HasF.WithSelf.F.type.a73
// CHECK:STDOUT: %HasF.WithSelf.F => constants.%HasF.WithSelf.F.851
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @HasF.WithSelf.F(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @HasF.WithSelf(constants.%HasF.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%HasF.facet
// CHECK:STDOUT: %HasF.WithSelf.F.type => constants.%HasF.WithSelf.F.type.722
// CHECK:STDOUT: %HasF.WithSelf.F => constants.%HasF.WithSelf.F.689
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @HasF.WithSelf.F(constants.%HasF.facet) {}
// CHECK:STDOUT:
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