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carbon-lang/toolchain/check/testdata/basics/raw_identifier.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
// 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/basics/raw_identifier.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/basics/raw_identifier.carbon
fn A(n: ()) -> () {
return r#n;
}
fn B(r#n: ()) -> () {
return n;
}
fn C(r#if: ()) -> () {
return r#if;
}
// CHECK:STDOUT: --- raw_identifier.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: %pattern_type: type = pattern_type %empty_tuple.type [concrete]
// CHECK:STDOUT: %n.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %n.patt: %pattern_type = wrapper_binding_pattern n, %n.param_patt [concrete]
// CHECK:STDOUT: %.262: Core.Form = init_form %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: %B.type: type = fn_type @B [concrete]
// CHECK:STDOUT: %B: %B.type = struct_value () [concrete]
// CHECK:STDOUT: %if.param_patt: %pattern_type = value_param_pattern [concrete]
// CHECK:STDOUT: %if.patt: %pattern_type = wrapper_binding_pattern r#if, %if.param_patt [concrete]
// CHECK:STDOUT: %C.type: type = fn_type @C [concrete]
// CHECK:STDOUT: %C: %C.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .A = %A.decl
// CHECK:STDOUT: .B = %B.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %A.decl: %A.type = fn_decl @A [concrete = constants.%A] {
// CHECK:STDOUT: %n.param_patt: %pattern_type = value_param_pattern [concrete = constants.%n.param_patt]
// CHECK:STDOUT: %n.patt: %pattern_type = wrapper_binding_pattern n, %n.param_patt [concrete = constants.%n.patt]
// 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, %.loc14_17.2 [concrete = constants.%return.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc14_17.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc14_17.2: type = converted %.loc14_17.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc14_17.3: Core.Form = init_form %.loc14_17.2 [concrete = constants.%.262]
// CHECK:STDOUT: %n.param: %empty_tuple.type = value_param call_param0
// CHECK:STDOUT: %.loc14_10.1: type = splice_block %.loc14_10.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc14_10.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc14_10.3: type = converted %.loc14_10.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %n: %empty_tuple.type = wrapper_binding n, %n.param
// CHECK:STDOUT: %return.param: ref %empty_tuple.type = out_param call_param1
// CHECK:STDOUT: %return: ref %empty_tuple.type = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %B.decl: %B.type = fn_decl @B [concrete = constants.%B] {
// CHECK:STDOUT: %n.param_patt: %pattern_type = value_param_pattern [concrete = constants.%n.param_patt]
// CHECK:STDOUT: %n.patt: %pattern_type = wrapper_binding_pattern n, %n.param_patt [concrete = constants.%n.patt]
// 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, %.loc18_19.2 [concrete = constants.%return.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc18_19.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc18_19.2: type = converted %.loc18_19.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc18_19.3: Core.Form = init_form %.loc18_19.2 [concrete = constants.%.262]
// CHECK:STDOUT: %n.param: %empty_tuple.type = value_param call_param0
// CHECK:STDOUT: %.loc18_12.1: type = splice_block %.loc18_12.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc18_12.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc18_12.3: type = converted %.loc18_12.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %n: %empty_tuple.type = wrapper_binding n, %n.param
// CHECK:STDOUT: %return.param: ref %empty_tuple.type = out_param call_param1
// CHECK:STDOUT: %return: ref %empty_tuple.type = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %C.decl: %C.type = fn_decl @C [concrete = constants.%C] {
// CHECK:STDOUT: %if.param_patt: %pattern_type = value_param_pattern [concrete = constants.%if.param_patt]
// CHECK:STDOUT: %if.patt: %pattern_type = wrapper_binding_pattern r#if, %if.param_patt [concrete = constants.%if.patt]
// 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, %.loc22_20.2 [concrete = constants.%return.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc22_20.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc22_20.2: type = converted %.loc22_20.1, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: %.loc22_20.3: Core.Form = init_form %.loc22_20.2 [concrete = constants.%.262]
// CHECK:STDOUT: %if.param: %empty_tuple.type = value_param call_param0
// CHECK:STDOUT: %.loc22_13.1: type = splice_block %.loc22_13.3 [concrete = constants.%empty_tuple.type] {
// CHECK:STDOUT: %.loc22_13.2: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc22_13.3: type = converted %.loc22_13.2, constants.%empty_tuple.type [concrete = constants.%empty_tuple.type]
// CHECK:STDOUT: }
// CHECK:STDOUT: %if: %empty_tuple.type = wrapper_binding r#if, %if.param
// CHECK:STDOUT: %return.param: ref %empty_tuple.type = out_param call_param1
// CHECK:STDOUT: %return: ref %empty_tuple.type = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @A(%n.param: %empty_tuple.type) -> out %return.param: %empty_tuple.type {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %n.ref: %empty_tuple.type = name_ref n, %n
// CHECK:STDOUT: %.loc15_10: init %empty_tuple.type = tuple_init () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc15_13: init %empty_tuple.type = converted %n.ref, %.loc15_10 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: return %.loc15_13
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @B(%n.param: %empty_tuple.type) -> out %return.param: %empty_tuple.type {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %n.ref: %empty_tuple.type = name_ref n, %n
// CHECK:STDOUT: %.loc19_10: init %empty_tuple.type = tuple_init () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc19_11: init %empty_tuple.type = converted %n.ref, %.loc19_10 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: return %.loc19_11
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C(%if.param: %empty_tuple.type) -> out %return.param: %empty_tuple.type {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %if.ref: %empty_tuple.type = name_ref r#if, %if
// CHECK:STDOUT: %.loc23_10: init %empty_tuple.type = tuple_init () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc23_14: init %empty_tuple.type = converted %if.ref, %.loc23_10 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: return %.loc23_14
// CHECK:STDOUT: }
// CHECK:STDOUT:
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