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carbon-lang/toolchain/check/testdata/interface/self.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/self.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/self.carbon
interface UseSelf {
fn F[self: Self]() -> Self;
}
// CHECK:STDOUT: --- self.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %UseSelf.type: type = facet_type <@UseSelf> [concrete]
// CHECK:STDOUT: %Self: %UseSelf.type = symbolic_binding Self, 0 [symbolic]
// CHECK:STDOUT: %Self.binding.as_type: type = symbolic_binding_type Self, 0, %Self [symbolic]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.binding.as_type [symbolic]
// CHECK:STDOUT: %.52b: Core.Form = init_form %Self.binding.as_type, call_param1 [symbolic]
// CHECK:STDOUT: %UseSelf.WithSelf.F.type: type = fn_type @UseSelf.WithSelf.F, @UseSelf(%Self) [symbolic]
// CHECK:STDOUT: %UseSelf.WithSelf.F: %UseSelf.WithSelf.F.type = struct_value () [symbolic]
// CHECK:STDOUT: %UseSelf.assoc_type: type = assoc_entity_type @UseSelf [concrete]
// CHECK:STDOUT: %assoc0: %UseSelf.assoc_type = assoc_entity element0, @UseSelf.%UseSelf.WithSelf.F.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .UseSelf = %UseSelf.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %UseSelf.decl: type = interface_decl @UseSelf [concrete = constants.%UseSelf.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @UseSelf {
// CHECK:STDOUT: %Self.loc15: %UseSelf.type = symbolic_binding Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT: interface_with_self_decl @UseSelf [concrete]
// CHECK:STDOUT:
// CHECK:STDOUT: !with Self:
// CHECK:STDOUT: %UseSelf.WithSelf.F.decl: @UseSelf.%UseSelf.WithSelf.F.type (%UseSelf.WithSelf.F.type) = fn_decl @UseSelf.WithSelf.F [symbolic = @UseSelf.%UseSelf.WithSelf.F (constants.%UseSelf.WithSelf.F)] {
// CHECK:STDOUT: %self.patt: @UseSelf.WithSelf.F.%pattern_type (%pattern_type) = value_binding_pattern self [concrete]
// CHECK:STDOUT: %self.param_patt: @UseSelf.WithSelf.F.%pattern_type (%pattern_type) = value_param_pattern %self.patt, call_param0 [concrete]
// CHECK:STDOUT: %return.patt: @UseSelf.WithSelf.F.%pattern_type (%pattern_type) = return_slot_pattern [concrete]
// CHECK:STDOUT: %return.param_patt: @UseSelf.WithSelf.F.%pattern_type (%pattern_type) = out_param_pattern %return.patt, call_param1 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %Self.ref.loc16_25: %UseSelf.type = name_ref Self, @UseSelf.%Self.loc15 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc16_25: type = facet_access_type %Self.ref.loc16_25 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: %.loc16_25.2: type = converted %Self.ref.loc16_25, %Self.as_type.loc16_25 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: %.loc16_25.3: Core.Form = init_form %.loc16_25.2, call_param1 [symbolic = %.loc16_25.1 (constants.%.52b)]
// CHECK:STDOUT: %self.param: @UseSelf.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type) = value_param call_param0
// CHECK:STDOUT: %.loc16_14.1: type = splice_block %.loc16_14.2 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)] {
// CHECK:STDOUT: %Self.ref.loc16_14: %UseSelf.type = name_ref Self, @UseSelf.%Self.loc15 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type.loc16_14: type = facet_access_type %Self.ref.loc16_14 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: %.loc16_14.2: type = converted %Self.ref.loc16_14, %Self.as_type.loc16_14 [symbolic = %Self.binding.as_type (constants.%Self.binding.as_type)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @UseSelf.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type) = value_binding self, %self.param
// CHECK:STDOUT: %return.param: ref @UseSelf.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type) = out_param call_param1
// CHECK:STDOUT: %return: ref @UseSelf.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type) = return_slot %return.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %UseSelf.assoc_type = assoc_entity element0, %UseSelf.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc15
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: witness = (%UseSelf.WithSelf.F.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @UseSelf.WithSelf.F(@UseSelf.%Self.loc15: %UseSelf.type) {
// CHECK:STDOUT: %Self: %UseSelf.type = symbolic_binding Self, 0 [symbolic = %Self (constants.%Self)]
// 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: %.loc16_25.1: Core.Form = init_form %Self.binding.as_type, call_param1 [symbolic = %.loc16_25.1 (constants.%.52b)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%self.param: @UseSelf.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type)) -> out %return.param: @UseSelf.WithSelf.F.%Self.binding.as_type (%Self.binding.as_type);
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @UseSelf(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @UseSelf.WithSelf.F(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.binding.as_type => constants.%Self.binding.as_type
// CHECK:STDOUT: %pattern_type => constants.%pattern_type
// CHECK:STDOUT: %.loc16_25.1 => constants.%.52b
// CHECK:STDOUT: }
// CHECK:STDOUT:
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