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carbon-lang/toolchain/check/testdata/impl/import_extend_impl.carbon
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Dana Jansens 917a6ea971 Add an interface-with-self generic to each interface and same for constraints (#6667) 
Currently each interface has a `Self` facet internally that becomes a
binding to every entity inside the interface: associated constants,
functions, and require decls. Each of these has to be independently
generic as a result. This makes is challenging in extended name lookup
to move into an extended scope of an interface, as we have a specific
for the interface, but the names within require a different specific
that includes a `Self` facet value.

We generalize this relationship by adding a second generic to Interface,
called `generic_with_self`. When we want to work with entities inside
the interface, we move from the interface-without-specific to the
interface-with-self specific by adding a Self to the specific. This is
done independently of any particular entity inside the Interface, as
those entities are now all members of the interface-with-self generic.

Associated constants no longer need a generic of their own, as they do
not have separate generic bindings. Functions retain a generic, but if
the function has no generic arguments, it will have no bindings of its
own now.

Require decls retain a generic so that their specific can be
instantiated separately from the interface. Requiring the interface to
be complete does not require the types in a require decl to be complete
unless it is modified by `extend`. So we allow them to be completed
later by keeping them in a separate generic.

Named constraints look like interfaces and gain the additional inner
generic-with-self, with the same relationship to require decls.

This removes the need for name lookup to perform Substitution of a Self
facet into the extended scope instruction. Instead, the
`SpecificConstant` instruction inserted by a `require` decl is part of
the interface-with-self generic. When looking through a FacetType for
extended scopes, for each interface, we push the scope with the specific
for the interface-with-self. Then the constant value of the
`SpecificConstant` is correctly modified by the provided self
automatically through applying that specific.
2026-02-19 16:24:07 +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/import_extend_impl.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/impl/import_extend_impl.carbon
// --- extend_impl_library.carbon
library "[[@TEST_NAME]]";
interface I {
fn F();
}
class C {
extend impl as I {
fn F() {}
}
}
// --- use_imported_class_extend_impl.carbon
library "[[@TEST_NAME]]";
import library "extend_impl_library";
fn G(c: C) {
C.F();
c.F();
}
// CHECK:STDOUT: --- extend_impl_library.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.type.08c: type = fn_type @I.WithSelf.F, @I(%Self) [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.705: %I.WithSelf.F.type.08c = struct_value () [symbolic]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%I.WithSelf.F.decl [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness @C.as.I.impl.%I.impl_witness_table [concrete]
// CHECK:STDOUT: %C.as.I.impl.F.type: type = fn_type @C.as.I.impl.F [concrete]
// CHECK:STDOUT: %C.as.I.impl.F: %C.as.I.impl.F.type = struct_value () [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.ba3: type = fn_type @I.WithSelf.F, @I(%I.facet) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.0e5: %I.WithSelf.F.type.ba3 = struct_value () [concrete]
// CHECK:STDOUT: %empty_struct_type: type = struct_type {} [concrete]
// CHECK:STDOUT: %complete_type: <witness> = complete_type_witness %empty_struct_type [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: .C = %C.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: %C.decl: type = class_decl @C [concrete = constants.%C] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self.loc4: %I.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: interface_with_self_decl @I [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %I.WithSelf.F.decl: @I.%I.WithSelf.F.type (%I.WithSelf.F.type.08c) = fn_decl @I.WithSelf.F [symbolic = @I.%I.WithSelf.F (constants.%I.WithSelf.F.705)] {} {}
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %I.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc4
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: witness = (%I.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl: %Self.ref as %I.ref {
// CHECK:STDOUT: %C.as.I.impl.F.decl: %C.as.I.impl.F.type = fn_decl @C.as.I.impl.F [concrete = constants.%C.as.I.impl.F] {} {}
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (%C.as.I.impl.F.decl), @C.as.I.impl [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness %I.impl_witness_table [concrete = constants.%I.impl_witness]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .F = %C.as.I.impl.F.decl
// CHECK:STDOUT: witness = %I.impl_witness
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C {
// CHECK:STDOUT: impl_decl @C.as.I.impl [concrete] {} {
// CHECK:STDOUT: %Self.ref: type = name_ref Self, constants.%C [concrete = constants.%C]
// CHECK:STDOUT: %I.ref: type = name_ref I, file.%I.decl [concrete = constants.%I.type]
// CHECK:STDOUT: }
// 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: .I = <poisoned>
// CHECK:STDOUT: extend @C.as.I.impl.%I.ref
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.WithSelf.F(@I.%Self.loc4: %I.type) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.as.I.impl.F() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%Self) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self.loc5 => constants.%Self
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.08c
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.705
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%I.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self.loc5 => constants.%I.facet
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.ba3
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.0e5
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%I.facet) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- use_imported_class_extend_impl.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// 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: %pattern_type: type = pattern_type %C [concrete]
// CHECK:STDOUT: %G.type: type = fn_type @G [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %G: %G.type = struct_value () [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.type.a1f: type = fn_type @I.WithSelf.F, @I(%Self) [symbolic]
// CHECK:STDOUT: %I.WithSelf.F.cc3: %I.WithSelf.F.type.a1f = struct_value () [symbolic]
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %C.type.facet: %type = facet_value %C, () [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.b59: type = fn_type @I.WithSelf.F, @I(%C.type.facet) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.521: %I.WithSelf.F.type.b59 = struct_value () [concrete]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, imports.%Main.import_ref.972 [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness imports.%I.impl_witness_table [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type.7f9: type = fn_type @I.WithSelf.F, @I(%I.facet) [concrete]
// CHECK:STDOUT: %I.WithSelf.F.c5a: %I.WithSelf.F.type.7f9 = struct_value () [concrete]
// CHECK:STDOUT: %.a40: type = fn_type_with_self_type %I.WithSelf.F.type.7f9, %I.facet [concrete]
// CHECK:STDOUT: %C.as.I.impl.F.type: type = fn_type @C.as.I.impl.F [concrete]
// CHECK:STDOUT: %C.as.I.impl.F: %C.as.I.impl.F.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.I = import_ref Main//extend_impl_library, I, unloaded
// CHECK:STDOUT: %Main.C: type = import_ref Main//extend_impl_library, C, loaded [concrete = constants.%C]
// CHECK:STDOUT: %Main.import_ref.8f2: <witness> = import_ref Main//extend_impl_library, loc12_1, loaded [concrete = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.743 = import_ref Main//extend_impl_library, inst{{[0-9A-F]+}} [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.72a4a5.1: type = import_ref Main//extend_impl_library, loc9_18, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: %Main.import_ref.a54: %I.assoc_type = import_ref Main//extend_impl_library, loc5_9, loaded [concrete = constants.%assoc0]
// CHECK:STDOUT: %Main.F = import_ref Main//extend_impl_library, F, unloaded
// CHECK:STDOUT: %Main.import_ref.2362f8.2: %I.type = import_ref Main//extend_impl_library, loc4_13, loaded [symbolic = constants.%Self]
// CHECK:STDOUT: %Main.import_ref.c82 = import_ref Main//extend_impl_library, loc4_13, unloaded
// CHECK:STDOUT: %Main.import_ref.972: @I.%I.WithSelf.F.type (%I.WithSelf.F.type.a1f) = import_ref Main//extend_impl_library, loc5_9, loaded [symbolic = @I.%I.WithSelf.F (constants.%I.WithSelf.F.cc3)]
// CHECK:STDOUT: %Main.import_ref.a3d: <witness> = import_ref Main//extend_impl_library, loc9_20, loaded [concrete = constants.%I.impl_witness]
// CHECK:STDOUT: %Main.import_ref.569: type = import_ref Main//extend_impl_library, loc9_15, loaded [concrete = constants.%C]
// CHECK:STDOUT: %Main.import_ref.72a4a5.2: type = import_ref Main//extend_impl_library, loc9_18, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: %Main.import_ref.d12: %C.as.I.impl.F.type = import_ref Main//extend_impl_library, loc10_12, loaded [concrete = constants.%C.as.I.impl.F]
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (%Main.import_ref.d12), @C.as.I.impl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .I = imports.%Main.I
// CHECK:STDOUT: .C = imports.%Main.C
// CHECK:STDOUT: .G = %G.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %G.decl: %G.type = fn_decl @G [concrete = constants.%G] {
// CHECK:STDOUT: %c.patt: %pattern_type = value_binding_pattern c [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type = value_param_pattern %c.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %c.param: %C = value_param call_param0
// CHECK:STDOUT: %C.ref.loc6: type = name_ref C, imports.%Main.C [concrete = constants.%C]
// CHECK:STDOUT: %c: %C = value_binding c, %c.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I [from "extend_impl_library.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.c82
// CHECK:STDOUT: .F = imports.%Main.import_ref.a54
// CHECK:STDOUT: witness = (imports.%Main.F)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl: imports.%Main.import_ref.569 as imports.%Main.import_ref.72a4a5.2 [from "extend_impl_library.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: witness = imports.%Main.import_ref.a3d
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C [from "extend_impl_library.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.743
// CHECK:STDOUT: .F = <poisoned>
// CHECK:STDOUT: extend imports.%Main.import_ref.72a4a5.1
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @G(%c.param: %C) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %C.ref.loc7: type = name_ref C, imports.%Main.C [concrete = constants.%C]
// CHECK:STDOUT: %F.ref.loc7: %I.assoc_type = name_ref F, imports.%Main.import_ref.a54 [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc7: %.a40 = impl_witness_access constants.%I.impl_witness, element0 [concrete = constants.%C.as.I.impl.F]
// CHECK:STDOUT: %C.as.I.impl.F.call.loc7: init %empty_tuple.type = call %impl.elem0.loc7()
// CHECK:STDOUT: %c.ref: %C = name_ref c, %c
// CHECK:STDOUT: %F.ref.loc8: %I.assoc_type = name_ref F, imports.%Main.import_ref.a54 [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0.loc8: %.a40 = impl_witness_access constants.%I.impl_witness, element0 [concrete = constants.%C.as.I.impl.F]
// CHECK:STDOUT: %C.as.I.impl.F.call.loc8: init %empty_tuple.type = call %impl.elem0.loc8()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.WithSelf.F(imports.%Main.import_ref.2362f8.2: %I.type) [from "extend_impl_library.carbon"] {
// CHECK:STDOUT: fn;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.as.I.impl.F [from "extend_impl_library.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%Self) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.a1f
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.cc3
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%C.type.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%C.type.facet
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.b59
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.521
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%I.facet) {
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Self => constants.%I.facet
// CHECK:STDOUT: %I.WithSelf.F.type => constants.%I.WithSelf.F.type.7f9
// CHECK:STDOUT: %I.WithSelf.F => constants.%I.WithSelf.F.c5a
// CHECK:STDOUT: }
// CHECK:STDOUT:
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