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carbon-lang/toolchain/check/testdata/function/generic/resolve_used.carbon
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Jon Ross-Perkins c5eba90317 Change Destroy to use a CustomWitness instead of a blanket impl (#6512) 
Pursuant to recent decisions on #6124, switch `Destroy` to use a
`CustomWitness` for its implementation. Right now this is manufacturing
no-op implementation functions on each lookup, which obviously isn't
ideal but is intended as a first pass. I'm mostly trying to find the
right balance between updating the approach to reflect new decisions,
while still breaking apart work in a way.

The `CoreInterface` logic is intended to build on `CoreIdentifier`
support. We have a number of additional interfaces that require
specialized logic, and that'll extend pretty far with C++ interop, so it
seemed easiest to have a generic function for it. That's what's
replacing the logic inside C++ interop that was doing string comparisons
(which could have already been moved to `CoreIdentifier`, I just missed
it in my first pass).

This adds `CustomWitness` support because the `Destroy` witnesses can be
imported cross-file. `CustomWitness` was previously only used for C++
types, which don't yet support import, which is why that wasn't
previously an issue. The addition of `query_specific_interface_id` is
similarly needed in order to get correct sorting of witness blocks when
imported.

This PR also removes builtin constraint logic (note this is in a
separate commit to help review; it's not a separate PR because it's
difficult to split apart without tests breaking). This had been made
generic with the expectation that destroy, copy, move, and conversions
would all need related support. Under the new decision, we are not going
to do blanket impls and will instead just manufacture a `CustomWitness`
for everything.

A lot of SemIR fingerprints change, but that's probably because the
addition of `Destroy` on core classes is yielding structural changes.
2025-12-19 18:36:06 +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/int.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/function/generic/resolve_used.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/function/generic/resolve_used.carbon
// --- fail_todo_call_monomorphization_error.carbon
library "[[@TEST_NAME]]";
fn ErrorIfNIsZero(N:! Core.IntLiteral()) {
// Check that we resolve the definition of a used specific function by
// ensuring we produce an error when doing so. Notionally this error is
// produced as a result of instantiating the `Core.Int` template, although
// that's not how we currently model `Core.Int`.
// CHECK:STDERR: min_prelude/parts/int.carbon:11:9: error: integer type width of 0 is not positive [IntWidthNotPositive]
// CHECK:STDERR: adapt MakeInt(N);
// CHECK:STDERR: ^~~~~~~~~~
// CHECK:STDERR: fail_todo_call_monomorphization_error.carbon:[[@LINE+3]]:10: note: in `i0` used here [ResolvingSpecificHere]
// CHECK:STDERR: var v: Core.Int(N);
// CHECK:STDERR: ^~~~~~~~~~~
var v: Core.Int(N);
}
fn CallNegative() {
// CHECK:STDERR: fail_todo_call_monomorphization_error.carbon:[[@LINE+4]]:3: note: in `ErrorIfNIsZero(0)` used here [ResolvingSpecificHere]
// CHECK:STDERR: ErrorIfNIsZero(0);
// CHECK:STDERR: ^~~~~~~~~~~~~~
// CHECK:STDERR:
ErrorIfNIsZero(0);
}
// CHECK:STDOUT: --- fail_todo_call_monomorphization_error.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %type: type = facet_type <type> [concrete]
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %IntLiteral.type: type = fn_type @IntLiteral [concrete]
// CHECK:STDOUT: %IntLiteral: %IntLiteral.type = struct_value () [concrete]
// CHECK:STDOUT: %N: Core.IntLiteral = symbolic_binding N, 0 [symbolic]
// CHECK:STDOUT: %pattern_type.dc0: type = pattern_type Core.IntLiteral [concrete]
// CHECK:STDOUT: %ErrorIfNIsZero.type: type = fn_type @ErrorIfNIsZero [concrete]
// CHECK:STDOUT: %ErrorIfNIsZero: %ErrorIfNIsZero.type = struct_value () [concrete]
// CHECK:STDOUT: %Int.type: type = generic_class_type @Int [concrete]
// CHECK:STDOUT: %Int.generic: %Int.type = struct_value () [concrete]
// CHECK:STDOUT: %Int: type = class_type @Int, @Int(%N) [symbolic]
// CHECK:STDOUT: %require_complete.901: <witness> = require_complete_type %Int [symbolic]
// CHECK:STDOUT: %pattern_type.764: type = pattern_type %Int [symbolic]
// CHECK:STDOUT: %Destroy.type: type = facet_type <@Destroy> [concrete]
// CHECK:STDOUT: %Destroy.Op.type: type = fn_type @Destroy.Op [concrete]
// CHECK:STDOUT: %DestroyOp.type: type = fn_type @DestroyOp [concrete]
// CHECK:STDOUT: %DestroyOp: %DestroyOp.type = struct_value () [concrete]
// CHECK:STDOUT: %custom_witness.809: <witness> = custom_witness (%DestroyOp), @Destroy [concrete]
// CHECK:STDOUT: %Destroy.facet.3e3: %Destroy.type = facet_value %Int, (%custom_witness.809) [symbolic]
// CHECK:STDOUT: %.623: type = fn_type_with_self_type %Destroy.Op.type, %Destroy.facet.3e3 [symbolic]
// CHECK:STDOUT: %CallNegative.type: type = fn_type @CallNegative [concrete]
// CHECK:STDOUT: %CallNegative: %CallNegative.type = struct_value () [concrete]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete]
// CHECK:STDOUT: %ErrorIfNIsZero.specific_fn: <specific function> = specific_function %ErrorIfNIsZero, @ErrorIfNIsZero(%int_0) [concrete]
// CHECK:STDOUT: %i0: type = class_type @Int, @Int(%int_0) [concrete]
// CHECK:STDOUT: %complete_type.d94: <witness> = complete_type_witness <error> [concrete]
// CHECK:STDOUT: %pattern_type.47b: type = pattern_type %i0 [concrete]
// CHECK:STDOUT: %Destroy.facet.7e1: %Destroy.type = facet_value %i0, (%custom_witness.809) [concrete]
// CHECK:STDOUT: %.918: type = fn_type_with_self_type %Destroy.Op.type, %Destroy.facet.7e1 [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: .IntLiteral = %Core.IntLiteral
// CHECK:STDOUT: .Int = %Core.Int
// CHECK:STDOUT: .Destroy = %Core.Destroy
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.IntLiteral: %IntLiteral.type = import_ref Core//prelude/parts/int_literal, IntLiteral, loaded [concrete = constants.%IntLiteral]
// CHECK:STDOUT: %Core.Int: %Int.type = import_ref Core//prelude/parts/int, Int, loaded [concrete = constants.%Int.generic]
// CHECK:STDOUT: %Core.Destroy: type = import_ref Core//prelude/parts/destroy, Destroy, loaded [concrete = constants.%Destroy.type]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .ErrorIfNIsZero = %ErrorIfNIsZero.decl
// CHECK:STDOUT: .CallNegative = %CallNegative.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %ErrorIfNIsZero.decl: %ErrorIfNIsZero.type = fn_decl @ErrorIfNIsZero [concrete = constants.%ErrorIfNIsZero] {
// CHECK:STDOUT: %N.patt: %pattern_type.dc0 = symbolic_binding_pattern N, 0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %.loc4_39.1: type = splice_block %.loc4_39.3 [concrete = Core.IntLiteral] {
// CHECK:STDOUT: %.Self: %type = symbolic_binding .Self [symbolic_self = constants.%.Self]
// CHECK:STDOUT: %Core.ref.loc4: <namespace> = name_ref Core, imports.%Core [concrete = imports.%Core]
// CHECK:STDOUT: %IntLiteral.ref: %IntLiteral.type = name_ref IntLiteral, imports.%Core.IntLiteral [concrete = constants.%IntLiteral]
// CHECK:STDOUT: %IntLiteral.call: init type = call %IntLiteral.ref() [concrete = Core.IntLiteral]
// CHECK:STDOUT: %.loc4_39.2: type = value_of_initializer %IntLiteral.call [concrete = Core.IntLiteral]
// CHECK:STDOUT: %.loc4_39.3: type = converted %IntLiteral.call, %.loc4_39.2 [concrete = Core.IntLiteral]
// CHECK:STDOUT: }
// CHECK:STDOUT: %N.loc4_19.2: Core.IntLiteral = symbolic_binding N, 0 [symbolic = %N.loc4_19.1 (constants.%N)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %CallNegative.decl: %CallNegative.type = fn_decl @CallNegative [concrete = constants.%CallNegative] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @ErrorIfNIsZero(%N.loc4_19.2: Core.IntLiteral) {
// CHECK:STDOUT: %N.loc4_19.1: Core.IntLiteral = symbolic_binding N, 0 [symbolic = %N.loc4_19.1 (constants.%N)]
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Int.loc15_20.2: type = class_type @Int, @Int(%N.loc4_19.1) [symbolic = %Int.loc15_20.2 (constants.%Int)]
// CHECK:STDOUT: %require_complete: <witness> = require_complete_type %Int.loc15_20.2 [symbolic = %require_complete (constants.%require_complete.901)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Int.loc15_20.2 [symbolic = %pattern_type (constants.%pattern_type.764)]
// CHECK:STDOUT: %Destroy.facet: %Destroy.type = facet_value %Int.loc15_20.2, (constants.%custom_witness.809) [symbolic = %Destroy.facet (constants.%Destroy.facet.3e3)]
// CHECK:STDOUT: %.loc15_3: type = fn_type_with_self_type constants.%Destroy.Op.type, %Destroy.facet [symbolic = %.loc15_3 (constants.%.623)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: name_binding_decl {
// CHECK:STDOUT: %v.patt: @ErrorIfNIsZero.%pattern_type (%pattern_type.764) = ref_binding_pattern v [concrete]
// CHECK:STDOUT: %v.var_patt: @ErrorIfNIsZero.%pattern_type (%pattern_type.764) = var_pattern %v.patt [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v.var: ref @ErrorIfNIsZero.%Int.loc15_20.2 (%Int) = var %v.var_patt
// CHECK:STDOUT: %.loc15_20: type = splice_block %Int.loc15_20.1 [symbolic = %Int.loc15_20.2 (constants.%Int)] {
// CHECK:STDOUT: %Core.ref.loc15: <namespace> = name_ref Core, imports.%Core [concrete = imports.%Core]
// CHECK:STDOUT: %Int.ref: %Int.type = name_ref Int, imports.%Core.Int [concrete = constants.%Int.generic]
// CHECK:STDOUT: %N.ref: Core.IntLiteral = name_ref N, %N.loc4_19.2 [symbolic = %N.loc4_19.1 (constants.%N)]
// CHECK:STDOUT: %Int.loc15_20.1: type = class_type @Int, @Int(constants.%N) [symbolic = %Int.loc15_20.2 (constants.%Int)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %v: ref @ErrorIfNIsZero.%Int.loc15_20.2 (%Int) = ref_binding v, %v.var
// CHECK:STDOUT: %DestroyOp.bound: <bound method> = bound_method %v.var, constants.%DestroyOp
// CHECK:STDOUT: %DestroyOp.call: init %empty_tuple.type = call %DestroyOp.bound(%v.var)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @DestroyOp(%self.param: @ErrorIfNIsZero.%Int.loc15_20.2 (%Int)) = "no_op";
// CHECK:STDOUT:
// CHECK:STDOUT: fn @CallNegative() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %ErrorIfNIsZero.ref: %ErrorIfNIsZero.type = name_ref ErrorIfNIsZero, file.%ErrorIfNIsZero.decl [concrete = constants.%ErrorIfNIsZero]
// CHECK:STDOUT: %int_0: Core.IntLiteral = int_value 0 [concrete = constants.%int_0]
// CHECK:STDOUT: %ErrorIfNIsZero.specific_fn: <specific function> = specific_function %ErrorIfNIsZero.ref, @ErrorIfNIsZero(constants.%int_0) [concrete = constants.%ErrorIfNIsZero.specific_fn]
// CHECK:STDOUT: %ErrorIfNIsZero.call: init %empty_tuple.type = call %ErrorIfNIsZero.specific_fn()
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ErrorIfNIsZero(constants.%N) {
// CHECK:STDOUT: %N.loc4_19.1 => constants.%N
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @ErrorIfNIsZero(constants.%int_0) {
// CHECK:STDOUT: %N.loc4_19.1 => constants.%int_0
// CHECK:STDOUT:
// CHECK:STDOUT: !definition:
// CHECK:STDOUT: %Int.loc15_20.2 => constants.%i0
// CHECK:STDOUT: %require_complete => constants.%complete_type.d94
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.47b
// CHECK:STDOUT: %Destroy.facet => constants.%Destroy.facet.7e1
// CHECK:STDOUT: %.loc15_3 => constants.%.918
// CHECK:STDOUT: }
// CHECK:STDOUT:
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