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carbon-lang/toolchain/check/testdata/interface/generic_binding_after_assoc_const.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/generic_binding_after_assoc_const.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/interface/generic_binding_after_assoc_const.carbon
interface I {
fn F(T:! type);
let U:! type;
// This `T` should have index 1, just like the `T` above.
// The intervening `U:! type` should not cause this to have index 2.
fn G(T:! type);
}
// CHECK:STDOUT: --- generic_binding_after_assoc_const.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: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %T: type = symbolic_binding T, 1 [symbolic]
// CHECK:STDOUT: %pattern_type: type = pattern_type type [concrete]
// CHECK:STDOUT: %I.WithSelf.F.type: type = fn_type @I.WithSelf.F, @I(%Self) [symbolic]
// CHECK:STDOUT: %I.WithSelf.F: %I.WithSelf.F.type = 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: %assoc1: %I.assoc_type = assoc_entity element1, @I.%U [concrete]
// CHECK:STDOUT: %I.WithSelf.G.type: type = fn_type @I.WithSelf.G, @I(%Self) [symbolic]
// CHECK:STDOUT: %I.WithSelf.G: %I.WithSelf.G.type = struct_value () [symbolic]
// CHECK:STDOUT: %assoc2: %I.assoc_type = assoc_entity element2, @I.%I.WithSelf.G.decl [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self.loc15: %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) = fn_decl @I.WithSelf.F [symbolic = @I.%I.WithSelf.F (constants.%I.WithSelf.F)] {
// CHECK:STDOUT: %T.patt: %pattern_type = symbolic_binding_pattern T, 1 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %T.loc16_8.2: type = symbolic_binding T, 1 [symbolic = %T.loc16_8.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %I.WithSelf.F.decl [concrete = constants.%assoc0]
// CHECK:STDOUT: %U: type = assoc_const_decl @U [concrete] {
// CHECK:STDOUT: %assoc1: %I.assoc_type = assoc_entity element1, @I.%U [concrete = constants.%assoc1]
// CHECK:STDOUT: }
// CHECK:STDOUT: %I.WithSelf.G.decl: @I.%I.WithSelf.G.type (%I.WithSelf.G.type) = fn_decl @I.WithSelf.G [symbolic = @I.%I.WithSelf.G (constants.%I.WithSelf.G)] {
// CHECK:STDOUT: %T.patt: %pattern_type = symbolic_binding_pattern T, 1 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %T.loc20_8.2: type = symbolic_binding T, 1 [symbolic = %T.loc20_8.1 (constants.%T)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc2: %I.assoc_type = assoc_entity element2, %I.WithSelf.G.decl [concrete = constants.%assoc2]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self.loc15
// CHECK:STDOUT: .F = %assoc0
// CHECK:STDOUT: .U = @U.%assoc1
// CHECK:STDOUT: .G = %assoc2
// CHECK:STDOUT: witness = (%I.WithSelf.F.decl, %U, %I.WithSelf.G.decl)
// CHECK:STDOUT:
// CHECK:STDOUT: !requires:
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.WithSelf.F(@I.%Self.loc15: %I.type, %T.loc16_8.2: type) {
// CHECK:STDOUT: %T.loc16_8.1: type = symbolic_binding T, 1 [symbolic = %T.loc16_8.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.WithSelf.G(@I.%Self.loc15: %I.type, %T.loc20_8.2: type) {
// CHECK:STDOUT: %T.loc20_8.1: type = symbolic_binding T, 1 [symbolic = %T.loc20_8.1 (constants.%T)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn();
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I(constants.%Self) {}
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.F(constants.%Self, constants.%T) {
// CHECK:STDOUT: %T.loc16_8.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.WithSelf.G(constants.%Self, constants.%T) {
// CHECK:STDOUT: %T.loc20_8.1 => constants.%T
// CHECK:STDOUT: }
// CHECK:STDOUT:
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