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carbon-lang/toolchain/check/testdata/interface/fail_duplicate.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/interface/fail_duplicate.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/fail_duplicate.carbon
// --- fail_redefine_without_dependents.carbon
library "[[@TEST_NAME]]";
interface Interface { }
// CHECK:STDERR: fail_redefine_without_dependents.carbon:[[@LINE+7]]:1: error: redefinition of `interface Interface` [RedeclRedef]
// CHECK:STDERR: interface Interface {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_redefine_without_dependents.carbon:[[@LINE-5]]:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: interface Interface { }
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
interface Interface {
fn F();
}
// --- fail_redefine_with_dependents.carbon
library "[[@TEST_NAME]]";
interface Interface {}
// CHECK:STDERR: fail_redefine_with_dependents.carbon:[[@LINE+7]]:1: error: redefinition of `interface Interface` [RedeclRedef]
// CHECK:STDERR: interface Interface {
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR: fail_redefine_with_dependents.carbon:[[@LINE-5]]:1: note: previously defined here [RedeclPrevDef]
// CHECK:STDERR: interface Interface {}
// CHECK:STDERR: ^~~~~~~~~~~~~~~~~~~~~
// CHECK:STDERR:
interface Interface {
fn F[self: Self]();
}
// --- fail_name_conflict_with_fn.carbon
library "[[@TEST_NAME]]";
fn Function();
// CHECK:STDERR: fail_name_conflict_with_fn.carbon:[[@LINE+7]]:11: error: duplicate name `Function` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: interface Function;
// CHECK:STDERR: ^~~~~~~~
// CHECK:STDERR: fail_name_conflict_with_fn.carbon:[[@LINE-5]]:1: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: fn Function();
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
interface Function;
// --- fail_name_conflict_with_class.carbon
class Class;
// CHECK:STDERR: fail_name_conflict_with_class.carbon:[[@LINE+7]]:11: error: duplicate name `Class` being declared in the same scope [NameDeclDuplicate]
// CHECK:STDERR: interface Class { }
// CHECK:STDERR: ^~~~~
// CHECK:STDERR: fail_name_conflict_with_class.carbon:[[@LINE-5]]:1: note: name is previously declared here [NameDeclPrevious]
// CHECK:STDERR: class Class;
// CHECK:STDERR: ^~~~~~~~~~~~
// CHECK:STDERR:
interface Class { }
// CHECK:STDOUT: --- fail_redefine_without_dependents.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Interface.type.6f2e43.1: type = facet_type <@Interface.loc4> [concrete]
// CHECK:STDOUT: %Self.8875a4.1: %Interface.type.6f2e43.1 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Interface.type.6f2e43.2: type = facet_type <@Interface.loc13> [concrete]
// CHECK:STDOUT: %Self.8875a4.2: %Interface.type.6f2e43.2 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F.type: type = fn_type @Interface.WithSelf.F, @Interface.loc13(%Self.8875a4.2) [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F: %Interface.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %Interface.assoc_type: type = assoc_entity_type @Interface.loc13 [concrete]
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, @Interface.loc13.%Interface.WithSelf.F.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Interface = %Interface.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Interface.decl.loc4: type = interface_decl @Interface.loc4 [concrete = constants.%Interface.type.6f2e43.1] {} {}
// CHECK:STDOUT: %Interface.decl.loc13: type = interface_decl @Interface.loc13 [concrete = constants.%Interface.type.6f2e43.2] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc4 {
// CHECK:STDOUT: %Self: %Interface.type.6f2e43.1 = symbolic_binding Self, 0 [symbolic = constants.%Self.8875a4.1]
// CHECK:STDOUT: interface_with_self_decl @Interface.loc4 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc13 {
// CHECK:STDOUT: %Self.loc13: %Interface.type.6f2e43.2 = symbolic_binding Self, 0 [symbolic = constants.%Self.8875a4.2]
// CHECK:STDOUT: interface_with_self_decl @Interface.loc13 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %Interface.WithSelf.F.decl: @Interface.loc13.%Interface.WithSelf.F.type (%Interface.WithSelf.F.type) = fn_decl @Interface.WithSelf.F [symbolic = @Interface.loc13.%Interface.WithSelf.F (constants.%Interface.WithSelf.F)] {} {}
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, %Interface.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc13
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: witness = (%Interface.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Interface.WithSelf.F(@Interface.loc13.%Self.loc13: %Interface.type.6f2e43.2) {
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.loc4(constants.%Self.8875a4.1) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.loc13(constants.%Self.8875a4.2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.F(constants.%Self.8875a4.2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_redefine_with_dependents.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Interface.type.6f2e43.1: type = facet_type <@Interface.loc4> [concrete]
// CHECK:STDOUT: %Self.8875a4.1: %Interface.type.6f2e43.1 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Interface.type.6f2e43.2: type = facet_type <@Interface.loc13> [concrete]
// CHECK:STDOUT: %Self.8875a4.2: %Interface.type.6f2e43.2 = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self.8875a4.2 [symbolic]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.binding.as_type [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F.type: type = fn_type @Interface.WithSelf.F, @Interface.loc13(%Self.8875a4.2) [symbolic]
// CHECK:STDOUT: %Interface.WithSelf.F: %Interface.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %Interface.assoc_type: type = assoc_entity_type @Interface.loc13 [concrete]
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, @Interface.loc13.%Interface.WithSelf.F.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Interface = %Interface.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Interface.decl.loc4: type = interface_decl @Interface.loc4 [concrete = constants.%Interface.type.6f2e43.1] {} {}
// CHECK:STDOUT: %Interface.decl.loc13: type = interface_decl @Interface.loc13 [concrete = constants.%Interface.type.6f2e43.2] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc4 {
// CHECK:STDOUT: %Self: %Interface.type.6f2e43.1 = symbolic_binding Self, 0 [symbolic = constants.%Self.8875a4.1]
// CHECK:STDOUT: interface_with_self_decl @Interface.loc4 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Interface.loc13 {
// CHECK:STDOUT: %Self.loc13: %Interface.type.6f2e43.2 = symbolic_binding Self, 0 [symbolic = constants.%Self.8875a4.2]
// CHECK:STDOUT: interface_with_self_decl @Interface.loc13 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %Interface.WithSelf.F.decl: @Interface.loc13.%Interface.WithSelf.F.type (%Interface.WithSelf.F.type) = fn_decl @Interface.WithSelf.F [symbolic = @Interface.loc13.%Interface.WithSelf.F (constants.%Interface.WithSelf.F)] {
// CHECK:STDOUT: %self.patt: @Interface.WithSelf.F.%pattern_type (%pattern_type) = value_binding_pattern self [concrete]
// CHECK:STDOUT: %self.param_patt: @Interface.WithSelf.F.%pattern_type (%pattern_type) = value_param_pattern %self.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: @Interface.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type) = value_param call_param0
// CHECK:STDOUT: %.loc14_14.1: type = splice_block %.loc14_14.2 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)] {
// CHECK:STDOUT: %Self.ref: %Interface.type.6f2e43.2 = name_ref Self, @Interface.loc13.%Self.loc13 [symbolic = %Self (constants.%Self.8875a4.2)]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self.ref [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: %.loc14_14.2: type = converted %Self.ref, %Self.as_type [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @Interface.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type) = value_binding self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %Interface.assoc_type = assoc_entity element0, %Interface.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc13
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: witness = (%Interface.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @Interface.WithSelf.F(@Interface.loc13.%Self.loc13: %Interface.type.6f2e43.2) {
// CHECK:STDOUT: %Self: %Interface.type.6f2e43.2 = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self.8875a4.2)]
// CHECK:STDOUT: %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.binding.as_type [symbolic = %pattern_type (constants.%pattern_type)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%self.param: @Interface.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type));
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.loc4(constants.%Self.8875a4.1) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.loc13(constants.%Self.8875a4.2) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Interface.WithSelf.F(constants.%Self.8875a4.2) {
// CHECK:STDOUT: %Self => constants.%Self.8875a4.2
// CHECK:STDOUT: %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT: %pattern_type => constants.%pattern_type
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_name_conflict_with_fn.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Function.type.7c0: type = fn_type @Function.loc4 [concrete]
// CHECK:STDOUT: %Function: %Function.type.7c0 = struct_value () [concrete]
// CHECK:STDOUT: %Function.type.1b7: type = facet_type <@Function.loc13> [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Function = %Function.decl.loc4
// CHECK:STDOUT: }
// CHECK:STDOUT: %Function.decl.loc4: %Function.type.7c0 = fn_decl @Function.loc4 [concrete = constants.%Function] {} {}
// CHECK:STDOUT: %Function.decl.loc13: type = interface_decl @Function.loc13 [concrete = constants.%Function.type.1b7] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Function.loc13;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @Function.loc4();
// CHECK:STDOUT:
// CHECK:STDOUT: --- fail_name_conflict_with_class.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %Class: type = class_type @Class.loc2 [concrete]
// CHECK:STDOUT: %Class.type: type = facet_type <@Class.loc11> [concrete]
// CHECK:STDOUT: %Self: %Class.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Class = %Class.decl.loc2
// CHECK:STDOUT: }
// CHECK:STDOUT: %Class.decl.loc2: type = class_decl @Class.loc2 [concrete = constants.%Class] {} {}
// CHECK:STDOUT: %Class.decl.loc11: type = interface_decl @Class.loc11 [concrete = constants.%Class.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @Class.loc11 {
// CHECK:STDOUT: %Self: %Class.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: interface_with_self_decl @Class.loc11 [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @Class.loc2;
// CHECK:STDOUT:
// CHECK:STDOUT: specific @Class.loc11(constants.%Self) {}
// CHECK:STDOUT:
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