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carbon-lang/toolchain/check/testdata/pointer/fail_deref_not_pointer.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/int.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/pointer/fail_deref_not_pointer.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/pointer/fail_deref_not_pointer.carbon
fn Deref(n: i32) {
// CHECK:STDERR: fail_deref_not_pointer.carbon:[[@LINE+4]]:3: error: cannot dereference operand of non-pointer type `i32` [DerefOfNonPointer]
// CHECK:STDERR: *n;
// CHECK:STDERR: ^
// CHECK:STDERR:
*n;
// CHECK:STDERR: fail_deref_not_pointer.carbon:[[@LINE+4]]:4: error: cannot apply `->` operator to non-pointer type `i32` [ArrowOperatorOfNonPointer]
// CHECK:STDERR: n->foo;
// CHECK:STDERR: ^~
// CHECK:STDERR:
n->foo;
// CHECK:STDERR: fail_deref_not_pointer.carbon:[[@LINE+4]]:3: error: cannot dereference operand of non-pointer type `()` [DerefOfNonPointer]
// CHECK:STDERR: *();
// CHECK:STDERR: ^
// CHECK:STDERR:
*();
// CHECK:STDERR: fail_deref_not_pointer.carbon:[[@LINE+4]]:5: error: cannot apply `->` operator to non-pointer type `()` [ArrowOperatorOfNonPointer]
// CHECK:STDERR: ()->foo;
// CHECK:STDERR: ^~
// CHECK:STDERR:
()->foo;
// CHECK:STDERR: fail_deref_not_pointer.carbon:[[@LINE+4]]:3: error: cannot dereference operand of non-pointer type `{}` [DerefOfNonPointer]
// CHECK:STDERR: *{};
// CHECK:STDERR: ^
// CHECK:STDERR:
*{};
// CHECK:STDERR: fail_deref_not_pointer.carbon:[[@LINE+4]]:5: error: cannot apply `->` operator to non-pointer type `{}` [ArrowOperatorOfNonPointer]
// CHECK:STDERR: {}->foo;
// CHECK:STDERR: ^~
// CHECK:STDERR:
{}->foo;
}
// CHECK:STDOUT: --- fail_deref_not_pointer.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %int_32: Core.IntLiteral = int_value 32 [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %pattern_type.6b6: type = pattern_type %i32 [concrete]
// CHECK:STDOUT: %n.param_patt: %pattern_type.6b6 = value_param_pattern [concrete]
// CHECK:STDOUT: %n.patt: %pattern_type.6b6 = wrapper_binding_pattern n, %n.param_patt [concrete]
// CHECK:STDOUT: %Deref.type: type = fn_type @Deref [concrete]
// CHECK:STDOUT: %Deref: %Deref.type = struct_value () [concrete]
// CHECK:STDOUT: %empty_tuple: %empty_tuple.type = tuple_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %empty_struct: %empty_struct_type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .Deref = %Deref.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %Deref.decl: %Deref.type = fn_decl @Deref [concrete = constants.%Deref] {
// CHECK:STDOUT: %n.param_patt: %pattern_type.6b6 = value_param_pattern [concrete = constants.%n.param_patt]
// CHECK:STDOUT: %n.patt: %pattern_type.6b6 = wrapper_binding_pattern n, %n.param_patt [concrete = constants.%n.patt]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %n.param: %i32 = value_param call_param0
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %n: %i32 = wrapper_binding n, %n.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Deref(%n.param: %i32) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %n.ref.loc20: %i32 = name_ref n, %n
// CHECK:STDOUT: %.loc20: ref <error> = deref %n.ref.loc20
// CHECK:STDOUT: %n.ref.loc25: %i32 = name_ref n, %n
// CHECK:STDOUT: %.loc25: ref <error> = deref %n.ref.loc25
// CHECK:STDOUT: %foo.ref.loc25: <error> = name_ref foo, <error> [concrete = <error>]
// CHECK:STDOUT: %.loc30_5.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %empty_tuple.loc30: %empty_tuple.type = tuple_value () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc30_5.2: %empty_tuple.type = converted %.loc30_5.1, %empty_tuple.loc30 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc30_3: ref <error> = deref %.loc30_5.2 [concrete = <error>]
// CHECK:STDOUT: %.loc35_4.1: %empty_tuple.type = tuple_literal () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %empty_tuple.loc35: %empty_tuple.type = tuple_value () [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc35_4.2: %empty_tuple.type = converted %.loc35_4.1, %empty_tuple.loc35 [concrete = constants.%empty_tuple]
// CHECK:STDOUT: %.loc35_5: ref <error> = deref %.loc35_4.2 [concrete = <error>]
// CHECK:STDOUT: %foo.ref.loc35: <error> = name_ref foo, <error> [concrete = <error>]
// CHECK:STDOUT: %.loc40_5.1: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %empty_struct.loc40: %empty_struct_type = struct_value () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc40_5.2: %empty_struct_type = converted %.loc40_5.1, %empty_struct.loc40 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc40_3: ref <error> = deref %.loc40_5.2 [concrete = <error>]
// CHECK:STDOUT: %.loc45_4.1: %empty_struct_type = struct_literal () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %empty_struct.loc45: %empty_struct_type = struct_value () [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc45_4.2: %empty_struct_type = converted %.loc45_4.1, %empty_struct.loc45 [concrete = constants.%empty_struct]
// CHECK:STDOUT: %.loc45_5: ref <error> = deref %.loc45_4.2 [concrete = <error>]
// CHECK:STDOUT: %foo.ref.loc45: <error> = name_ref foo, <error> [concrete = <error>]
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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