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carbon-lang/toolchain/check/testdata/facet/self_in_interface_param.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
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/facet/self_in_interface_param.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/facet/self_in_interface_param.carbon
interface I(T: type) {
let I1: type;
}
//@dump-sem-ir-begin
fn F(generic T: I(.Self) where .I1 = ()) -> T.I1 {
return ();
}
//@dump-sem-ir-end
fn G(generic _: I(.Self) where .I1 = ()) {}
// CHECK:STDOUT: --- self_in_interface_param.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self.frozen.e58: type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %I.type.335: type = generic_interface_type @I [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %I.generic: %I.type.335 = struct_value () [concrete]
// CHECK:STDOUT: %I.type.fc5: type = facet_type <@I, @I(%.Self.frozen.e58)> [symbolic_self]
// CHECK:STDOUT: %.Self.frozen.dfc: %I.type.fc5 = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %I.assoc_type.51f: type = assoc_entity_type @I, @I(%.Self.frozen.e58) [symbolic_self]
// CHECK:STDOUT: %assoc0.03d: %I.assoc_type.51f = assoc_entity element0, @I.WithSelf.%I1 [symbolic_self]
// CHECK:STDOUT: %.Self.frozen.as_type: type = facet_access_type %.Self.frozen.dfc [symbolic_self]
// CHECK:STDOUT: %I.lookup_impl_witness.1f0: <witness> = lookup_impl_witness %.Self.frozen.dfc, @I, @I(%.Self.frozen.e58) [symbolic_self]
// CHECK:STDOUT: %impl.elem0.e47: type = impl_witness_access %I.lookup_impl_witness.1f0, element0 [symbolic_self]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %.Self.c86: type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %I.type.563: type = facet_type <@I, @I(%.Self.c86)> [symbolic_self]
// CHECK:STDOUT: %.Self.bd2: %I.type.fc5 = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %I.lookup_impl_witness.758: <witness> = lookup_impl_witness %.Self.bd2, @I, @I(%.Self.c86) [symbolic_self]
// CHECK:STDOUT: %impl.elem0.20e: type = impl_witness_access %I.lookup_impl_witness.758, element0 [symbolic_self]
// CHECK:STDOUT: %I_where.type.69e: type = facet_type <@I, @I(%.Self.c86) where %impl.elem0.20e = %empty_tuple.type> [symbolic_self]
// CHECK:STDOUT: %.Self.f32: %I.type.563 = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %I.lookup_impl_witness.085: <witness> = lookup_impl_witness %.Self.f32, @I, @I(%.Self.c86) [symbolic_self]
// CHECK:STDOUT: %impl.elem0.c46: type = impl_witness_access %I.lookup_impl_witness.085, element0 [symbolic_self]
// CHECK:STDOUT: %I_where.type.3e6: type = facet_type <@I, @I(%.Self.c86) where %impl.elem0.c46 = %empty_tuple.type> [symbolic_self]
// CHECK:STDOUT: %pattern_type.668: type = pattern_type %I_where.type.3e6 [symbolic_self]
// CHECK:STDOUT: %T.patt.b8e: %pattern_type.668 = symbolic_binding_pattern T, 0 [symbolic]
// CHECK:STDOUT: %T.f83: %I_where.type.3e6 = symbolic_binding T, 0 [symbolic]
// CHECK:STDOUT: %I.assoc_type.bed: type = assoc_entity_type @I, @I(%.Self.c86) [symbolic_self]
// CHECK:STDOUT: %assoc0.cad: %I.assoc_type.bed = assoc_entity element0, @I.WithSelf.%I1 [symbolic_self]
// CHECK:STDOUT: %T.as_type: type = facet_access_type %T.f83 [symbolic]
// CHECK:STDOUT: %I.type.e98: type = facet_type <@I, @I(%T.as_type)> [symbolic]
// CHECK:STDOUT: %I_where.type.7fa: type = facet_type <@I, @I(%T.as_type) where %impl.elem0.c46 = %empty_tuple.type> [symbolic]
// CHECK:STDOUT: %I.lookup_impl_witness.cc6: <witness> = lookup_impl_witness %T.f83, @I, @I(%T.as_type) [symbolic]
// CHECK:STDOUT: %.262: Core.Form = init_form %empty_tuple.type [concrete]
// CHECK:STDOUT: %pattern_type.cb1: type = pattern_type %empty_tuple.type [concrete]
// CHECK:STDOUT: %return.param_patt: %pattern_type.cb1 = out_param_pattern [concrete]
// CHECK:STDOUT: %return.patt: %pattern_type.cb1 = return_slot_pattern %return.param_patt, %empty_tuple.type [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %T.patt.loc18_15.1: %pattern_type.668 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc18_15.2 (constants.%T.patt.b8e)]
// CHECK:STDOUT: %return.param_patt: %pattern_type.cb1 = out_param_pattern [concrete = constants.%return.param_patt]
// CHECK:STDOUT: %return.patt: %pattern_type.cb1 = return_slot_pattern %return.param_patt, %impl.elem0.loc18_46 [concrete = constants.%return.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %T.ref: %I_where.type.3e6 = name_ref T, %T.loc18_15.2 [symbolic = %T.loc18_15.1 (constants.%T.f83)]
// CHECK:STDOUT: %T.as_type.loc18_46.2: type = facet_access_type %T.ref [symbolic = %T.as_type.loc18_46.1 (constants.%T.as_type)]
// CHECK:STDOUT: %.loc18_46.1: type = converted %T.ref, %T.as_type.loc18_46.2 [symbolic = %T.as_type.loc18_46.1 (constants.%T.as_type)]
// CHECK:STDOUT: %.loc18_46.2: %I.assoc_type.bed = specific_constant @I1.%assoc0, @I.WithSelf(constants.%.Self.c86, constants.%T.f83) [symbolic_self = constants.%assoc0.cad]
// CHECK:STDOUT: %I1.ref.loc18_46: %I.assoc_type.bed = name_ref I1, %.loc18_46.2 [symbolic_self = constants.%assoc0.cad]
// CHECK:STDOUT: %I.type.loc18_46.2: type = facet_type <@I, @I(constants.%T.as_type)> [symbolic = %I.type.loc18_46.1 (constants.%I.type.e98)]
// CHECK:STDOUT: %I_where.type.loc18_46.2: type = facet_type <@I, @I(constants.%T.as_type) where constants.%impl.elem0.c46 = constants.%empty_tuple.type> [symbolic = %I_where.type.loc18_46.1 (constants.%I_where.type.7fa)]
// CHECK:STDOUT: %impl.elem0.loc18_46: type = impl_witness_access constants.%I.lookup_impl_witness.cc6, element0 [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc18_46.3: Core.Form = init_form %impl.elem0.loc18_46 [concrete = constants.%.262]
// CHECK:STDOUT: %.loc18_26.1: type = splice_block %.loc18_26.3 [symbolic_self = constants.%I_where.type.3e6] {
// CHECK:STDOUT: %.Self.frozen.loc18_15: type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen.e58]
// CHECK:STDOUT: %I.ref: %I.type.335 = name_ref I, file.%I.decl [concrete = constants.%I.generic]
// CHECK:STDOUT: %.Self.ref.loc18_19: type = name_ref .Self, %.Self.frozen.loc18_15 [symbolic_self = constants.%.Self.frozen.e58]
// CHECK:STDOUT: %I.type.loc18_24.1: type = facet_type <@I, @I(constants.%.Self.frozen.e58)> [symbolic_self = constants.%I.type.fc5]
// CHECK:STDOUT: %.Self.frozen.loc18_26: %I.type.fc5 = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen.dfc]
// CHECK:STDOUT: %base_facet_type.loc18_26.1 = requirement_base_facet_type %I.type.loc18_24.1 [concrete]
// CHECK:STDOUT: %.Self.ref.loc18_32: %I.type.fc5 = name_ref .Self, %.Self.frozen.loc18_26 [symbolic_self = constants.%.Self.frozen.dfc]
// CHECK:STDOUT: %.Self.as_type: type = facet_access_type %.Self.ref.loc18_32 [symbolic_self = constants.%.Self.frozen.as_type]
// CHECK:STDOUT: %.loc18_32.1: type = converted %.Self.ref.loc18_32, %.Self.as_type [symbolic_self = constants.%.Self.frozen.as_type]
// CHECK:STDOUT: %.loc18_32.2: %I.assoc_type.51f = specific_constant @I1.%assoc0, @I.WithSelf(constants.%.Self.frozen.e58, constants.%.Self.frozen.dfc) [symbolic_self = constants.%assoc0.03d]
// CHECK:STDOUT: %I1.ref.loc18_32: %I.assoc_type.51f = name_ref I1, %.loc18_32.2 [symbolic_self = constants.%assoc0.03d]
// CHECK:STDOUT: %impl.elem0.loc18_32.1: type = impl_witness_access constants.%I.lookup_impl_witness.1f0, element0 [symbolic_self = constants.%impl.elem0.e47]
// CHECK:STDOUT: %.loc18_39.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc18_39.2: type = converted %.loc18_39.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %rewrite.loc18_36.1 = requirement_rewrite %impl.elem0.loc18_32.1, %.loc18_39.2 [concrete]
// CHECK:STDOUT: %I.type.loc18_24.2: type = facet_type <@I, @I(constants.%.Self.c86)> [symbolic_self = constants.%I.type.563]
// CHECK:STDOUT: %base_facet_type.loc18_26.2 = requirement_base_facet_type %I.type.loc18_24.2 [concrete]
// CHECK:STDOUT: %impl.elem0.loc18_32.2: type = impl_witness_access constants.%I.lookup_impl_witness.758, element0 [symbolic_self = constants.%impl.elem0.20e]
// CHECK:STDOUT: %rewrite.loc18_36.2 = requirement_rewrite %impl.elem0.loc18_32.2, %.loc18_39.2 [concrete]
// CHECK:STDOUT: %.loc18_26.2: type = where_expr [symbolic_self = constants.%I_where.type.69e] {
// CHECK:STDOUT: %base_facet_type.loc18_26.2 = requirement_base_facet_type %I.type.loc18_24.2 [concrete]
// CHECK:STDOUT: %rewrite.loc18_36.2 = requirement_rewrite %impl.elem0.loc18_32.2, %.loc18_39.2 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %impl.elem0.loc18_32.3: type = impl_witness_access constants.%I.lookup_impl_witness.085, element0 [symbolic_self = constants.%impl.elem0.c46]
// CHECK:STDOUT: %rewrite.loc18_36.3 = requirement_rewrite %impl.elem0.loc18_32.3, %.loc18_39.2 [concrete]
// CHECK:STDOUT: %.loc18_26.3: type = where_expr [symbolic_self = constants.%I_where.type.3e6] {
// CHECK:STDOUT: %base_facet_type.loc18_26.2 = requirement_base_facet_type %I.type.loc18_24.2 [concrete]
// CHECK:STDOUT: %rewrite.loc18_36.3 = requirement_rewrite %impl.elem0.loc18_32.3, %.loc18_39.2 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: %T.loc18_15.2: %I_where.type.3e6 = symbolic_binding T, 0 [symbolic = %T.loc18_15.1 (constants.%T.f83)]
// 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: generic fn @F(%T.loc18_15.2: %I_where.type.3e6) {
// CHECK:STDOUT: %T.patt.loc18_15.2: %pattern_type.668 = symbolic_binding_pattern T, 0 [symbolic = %T.patt.loc18_15.2 (constants.%T.patt.b8e)]
// CHECK:STDOUT: %T.loc18_15.1: %I_where.type.3e6 = symbolic_binding T, 0 [symbolic = %T.loc18_15.1 (constants.%T.f83)]
// CHECK:STDOUT: %T.as_type.loc18_46.1: type = facet_access_type %T.loc18_15.1 [symbolic = %T.as_type.loc18_46.1 (constants.%T.as_type)]
// CHECK:STDOUT: %I.type.loc18_46.1: type = facet_type <@I, @I(%T.as_type.loc18_46.1)> [symbolic = %I.type.loc18_46.1 (constants.%I.type.e98)]
// CHECK:STDOUT: %I_where.type.loc18_46.1: type = facet_type <@I, @I(%T.as_type.loc18_46.1) where constants.%impl.elem0.c46 = constants.%empty_tuple.type> [symbolic = %I_where.type.loc18_46.1 (constants.%I_where.type.7fa)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT:
// CHECK:STDOUT: fn() -> out %return.param: %empty_tuple.type {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %.loc19_11.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc19_11.2: init %empty_tuple.type = tuple_init () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc19_12: init %empty_tuple.type = converted %.loc19_11.1, %.loc19_11.2 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: return %.loc19_12
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @F(constants.%T.f83) {
// CHECK:STDOUT: %T.patt.loc18_15.2 => constants.%T.patt.b8e
// CHECK:STDOUT: %T.loc18_15.1 => constants.%T.f83
// CHECK:STDOUT: %T.as_type.loc18_46.1 => constants.%T.as_type
// CHECK:STDOUT: %I.type.loc18_46.1 => constants.%I.type.e98
// CHECK:STDOUT: %I_where.type.loc18_46.1 => constants.%I_where.type.7fa
// CHECK:STDOUT: }
// CHECK:STDOUT:
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