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carbon-lang/toolchain/check/testdata/impl/fail_impl_bad_interface.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/primitives.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/fail_impl_bad_interface.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/fail_impl_bad_interface.carbon
// --- fail_impl_as_false.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_impl_as_false.carbon:[[@LINE+7]]:13: error: cannot implicitly convert non-type value of type `bool` to `type` [ConversionFailureNonTypeToFacet]
// CHECK:STDERR: impl i32 as false {}
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_impl_as_false.carbon:[[@LINE+4]]:13: note: type `bool` does not implement interface `Core.ImplicitAs(type)` [MissingImplInMemberAccessInContext]
// CHECK:STDERR: impl i32 as false {}
// CHECK:STDERR: ^~~~~
// CHECK:STDERR:
impl i32 as false {}
// --- fail_impl_as_type.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_impl_as_type.carbon:[[@LINE+4]]:1: error: impl as 0 interfaces, expected 1 [ImplOfNotOneInterface]
// CHECK:STDERR: impl bool as type {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
impl bool as type {}
// --- fail_impl_as_type_where.carbon
library "[[@TEST_NAME]]";
// CHECK:STDERR: fail_impl_as_type_where.carbon:[[@LINE+4]]:1: error: impl as 0 interfaces, expected 1 [ImplOfNotOneInterface]
// CHECK:STDERR: impl f64 as type where .Self impls type {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
impl f64 as type where .Self impls type {}
// --- fail_impl_as_type_where_impls_interface.carbon
library "[[@TEST_NAME]]";
interface I {}
// CHECK:STDERR: fail_impl_as_type_where_impls_interface.carbon:[[@LINE+4]]:1: error: impl as 0 interfaces, expected 1 [ImplOfNotOneInterface]
// CHECK:STDERR: impl {.a: bool} as type where .Self impls I {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
impl {.a: bool} as type where .Self impls I {}
// CHECK:STDOUT: --- fail_impl_as_false.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: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %i32: type = class_type @Int, @Int(%int_32) [concrete]
// CHECK:STDOUT: %false: bool = bool_literal false [concrete]
// CHECK:STDOUT: %ImplicitAs.type.0ff: type = generic_interface_type @ImplicitAs [concrete]
// CHECK:STDOUT: %ImplicitAs.generic: %ImplicitAs.type.0ff = 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: .ImplicitAs = %Core.ImplicitAs
// 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: %Core.ImplicitAs: %ImplicitAs.type.0ff = import_ref Core//prelude/parts/as, ImplicitAs, loaded [concrete = constants.%ImplicitAs.generic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %.loc11: type = converted @i32.as.<error>.impl.%false, <error> [concrete = <error>]
// CHECK:STDOUT: impl_decl @i32.as.<error>.impl [concrete] {} {
// CHECK:STDOUT: %i32: type = type_literal constants.%i32 [concrete = constants.%i32]
// CHECK:STDOUT: %false: bool = bool_literal false [concrete = constants.%false]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @i32.as.<error>.impl: %i32 as <error> {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend <error>
// CHECK:STDOUT: witness = <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_impl_as_type.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Bool = %Core.Bool
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Bool: type = import_ref Core//prelude/parts/bool, Bool, loaded [concrete = bool]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: impl_decl @bool.as.<error>.impl [concrete] {} {
// CHECK:STDOUT: %.loc8_6: type = type_literal bool [concrete = bool]
// CHECK:STDOUT: %.loc8_14: type = type_literal type [concrete = type]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @bool.as.<error>.impl: %.loc8_6 as <error> {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend <error>
// CHECK:STDOUT: witness = <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_impl_as_type_where.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %int_64: Core.IntLiteral = int_value 64 [concrete]
// CHECK:STDOUT: %Float.type: type = generic_class_type @Float [concrete]
// CHECK:STDOUT: %Float.generic: %Float.type = struct_value () [concrete]
// CHECK:STDOUT: %f64: type = class_type @Float, @Float(%int_64) [concrete]
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %.Self: type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Float = %Core.Float
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Float: %Float.type = import_ref Core//prelude/parts/float, Float, loaded [concrete = constants.%Float.generic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: impl_decl @f64.as.<error>.impl [concrete] {} {
// CHECK:STDOUT: %f64: type = type_literal constants.%f64 [concrete = constants.%f64]
// CHECK:STDOUT: %.loc8_13: type = type_literal type [concrete = type]
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %base_facet_type = requirement_base_facet_type %.loc8_13 [concrete]
// CHECK:STDOUT: %.Self.ref.loc8_24.1: type = name_ref .Self, %.Self.frozen [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %.loc8_36: type = type_literal type [concrete = type]
// CHECK:STDOUT: %impls.loc8_30.1 = requirement_impls %.Self.ref.loc8_24.1, %.loc8_36 [concrete]
// CHECK:STDOUT: %.Self: type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.Self.ref.loc8_24.2: type = name_ref .Self, %.Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %impls.loc8_30.2 = requirement_impls %.Self.ref.loc8_24.2, %.loc8_36 [concrete]
// CHECK:STDOUT: %.loc8_18: type = where_expr [concrete = type] {
// CHECK:STDOUT: %base_facet_type = requirement_base_facet_type %.loc8_13 [concrete]
// CHECK:STDOUT: %impls.loc8_30.2 = requirement_impls %.Self.ref.loc8_24.2, %.loc8_36 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @f64.as.<error>.impl: %f64 as <error> {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend <error>
// CHECK:STDOUT: witness = <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_impl_as_type_where_impls_interface.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %struct_type.a: type = struct_type {.a: bool} [concrete]
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %.Self: type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %type_where: type = facet_type <type where .Self impls @I> [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .Bool = %Core.Bool
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.Bool: type = import_ref Core//prelude/parts/bool, Bool, loaded [concrete = bool]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: impl_decl @struct_type.a.as.<error>.impl [concrete] {} {
// CHECK:STDOUT: %.loc10_11: type = type_literal bool [concrete = bool]
// CHECK:STDOUT: %struct_type.a: type = struct_type {.a: bool} [concrete = constants.%struct_type.a]
// CHECK:STDOUT: %.loc10_20: type = type_literal type [concrete = type]
// CHECK:STDOUT: %.Self.frozen: type = symbolic_binding .Self [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %base_facet_type = requirement_base_facet_type %.loc10_20 [concrete]
// CHECK:STDOUT: %.Self.ref.loc10_31.1: type = name_ref .Self, %.Self.frozen [symbolic_self = constants.%.Self.frozen]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: %impls.loc10_37.1 = requirement_impls %.Self.ref.loc10_31.1, %I.ref [concrete]
// CHECK:STDOUT: %.Self: type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %.Self.ref.loc10_31.2: type = name_ref .Self, %.Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %impls.loc10_37.2 = requirement_impls %.Self.ref.loc10_31.2, %I.ref [concrete]
// CHECK:STDOUT: %.loc10_25: type = where_expr [concrete = constants.%type_where] {
// CHECK:STDOUT: %base_facet_type = requirement_base_facet_type %.loc10_20 [concrete]
// CHECK:STDOUT: %impls.loc10_37.2 = requirement_impls %.Self.ref.loc10_31.2, %I.ref [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: %I.WithSelf.decl = interface_with_self_decl @I [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @struct_type.a.as.<error>.impl: %struct_type.a as <error> {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: extend <error>
// CHECK:STDOUT: witness = <error>
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf(constants.%Self) {}
// CHECK:STDOUT:
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