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carbon-lang/toolchain/check/testdata/basics/include_in_dumps.carbon
T
Jon Ross-PerkinsandDana Jansens 5e3bb523f8 Add builtin functions for destroy, with special requirements in facet types (#6035) 
This is in support of a goal of changing the blanket `destroy` impl to
use (roughly):

```
private fn CanAggregateDestroy() -> type = "type.can_aggregate_destroy";

// Handles aggregate type destruction.
impl forall [AggregateDestroyT:! CanAggregateDestroy()] AggregateDestroyT as Destroy {
  fn Op[addr self: Self*]() = "type.aggregate_destroy";
}
```

That isn't done here because there's still other issues that migrating
raises. What this *does* do is add the builtin functions, and in
particular, support to `FacetTypeInfo` to make `CanAggregateDestroy`
work.

The "special requirement" approach in `FacetTypeInfo` allows us to
support restricting a blanket impl under the current approach of impls.
Maybe we'll find a cleaner approach that can work in the future, but
this fits into the current model by propagating similar to other
requirements. I'm using an enum mask because we have a number of similar
things to add (e.g. copy, move) but I'm not sure we need a full vector.

A few alternatives considered were:

- Supporting syntax more like `where .Self impls
TypeCanAggregateDestroy(.Self, SupportedInterface,
UnsupportedInterface)`. I think it'd be a little cleaner, but requires
better compile-time evaluation in order to assess the type of the call.
Right now it's expected to be a `FacetType` too early to make this work,
and I was concerned about pouring too much more time down this route.
- Providing an actual interface, in particular doing name lookup back
into `Core.` for an interface. This would've added name lookup overhead,
and the question of whether an `impl` exists.
- Generating an interface. This avoids the name lookup, but would still
raise the question of whether an `impl` should also be generated. Work
I've previously done generating interfaces for class destruction also
feels complex to both write and understand (an unfortunate issue).
- Still modeling as an `ImplsConstraint`, for example by defining a
special `InterfaceId::CanAggregateDestroy = -2` similar to what we do on
other ids. I was hesitant because of how this expands the number of
modes of `InterfaceId`, and things for consuming code to watch out for,
for what feels like a relatively niche set of use-cases that are only
interface-like.

---------

Co-authored-by: Dana Jansens <danakj@orodu.net>
2025-09-15 17:03:43 +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/convert.carbon
//
// This explicitly excludes some files, then set ranges to `if-present` so that
// we can see imports (particularly of `impl`s) from files that would be excluded without
// `//@include-in-dumps`.
// EXTRA-ARGS: --exclude-dump-file-prefix=exclude/ --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/basics/include_in_dumps.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/check/testdata/basics/include_in_dumps.carbon
// --- exclude/included.carbon
library "[[@TEST_NAME]]";
//@include-in-dumps
interface I {}
// --- exclude/included_with_range.carbon
library "[[@TEST_NAME]]";
//@include-in-dumps
//@dump-sem-ir-begin
interface I {
fn Op[self: Self]();
}
//@dump-sem-ir-end
class C {
impl C as I {
fn Op[self: Self]() {}
}
}
// --- import_included.carbon
library "[[@TEST_NAME]]";
import library "included_with_range";
fn F(c: C) { c.(I.Op)(); }
// --- exclude/excluded.carbon
library "[[@TEST_NAME]]";
interface I {}
// --- exclude/excluded_with_range.carbon
library "[[@TEST_NAME]]";
//@dump-sem-ir-begin
interface I {
fn Op[self: Self]();
}
//@dump-sem-ir-end
class C {
impl C as I {
fn Op[self: Self]() {}
}
}
// --- import_excluded.carbon
library "[[@TEST_NAME]]";
import library "excluded_with_range";
fn F(c: C) { c.(I.Op)(); }
// CHECK:STDOUT: --- exclude/included.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: package: <namespace> = namespace [concrete] {
// CHECK:STDOUT: .Core = imports.%Core
// CHECK:STDOUT: .I = %I.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = constants.%Self]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: witness = ()
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- exclude/included_with_range.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self.7ee: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %Self.as_type.a67: type = facet_access_type %Self.7ee [symbolic]
// CHECK:STDOUT: %pattern_type.d22: type = pattern_type %Self.as_type.a67 [symbolic]
// CHECK:STDOUT: %I.Op.type: type = fn_type @I.Op [concrete]
// CHECK:STDOUT: %I.Op: %I.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, @I.%I.Op.decl [concrete]
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %I.impl_witness: <witness> = impl_witness @C.%I.impl_witness_table [concrete]
// CHECK:STDOUT: %pattern_type.c48: type = pattern_type %C [concrete]
// CHECK:STDOUT: %I.facet: %I.type = facet_value %C, (%I.impl_witness) [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: file {
// CHECK:STDOUT: %I.decl: type = interface_decl @I [concrete = constants.%I.type] {} {}
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I {
// CHECK:STDOUT: <elided>
// CHECK:STDOUT: %I.Op.decl: %I.Op.type = fn_decl @I.Op [concrete = constants.%I.Op] {
// CHECK:STDOUT: %self.patt: @I.Op.%pattern_type (%pattern_type.d22) = binding_pattern self [concrete]
// CHECK:STDOUT: %self.param_patt: @I.Op.%pattern_type (%pattern_type.d22) = value_param_pattern %self.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %self.param: @I.Op.%Self.as_type.loc8_15.1 (%Self.as_type.a67) = value_param call_param0
// CHECK:STDOUT: %.loc8_15.1: type = splice_block %.loc8_15.2 [symbolic = %Self.as_type.loc8_15.1 (constants.%Self.as_type.a67)] {
// CHECK:STDOUT: %Self.ref: %I.type = name_ref Self, @I.%Self [symbolic = %Self (constants.%Self.7ee)]
// CHECK:STDOUT: %Self.as_type.loc8_15.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc8_15.1 (constants.%Self.as_type.a67)]
// CHECK:STDOUT: %.loc8_15.2: type = converted %Self.ref, %Self.as_type.loc8_15.2 [symbolic = %Self.as_type.loc8_15.1 (constants.%Self.as_type.a67)]
// CHECK:STDOUT: }
// CHECK:STDOUT: %self: @I.Op.%Self.as_type.loc8_15.1 (%Self.as_type.a67) = bind_name self, %self.param
// CHECK:STDOUT: }
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, %I.Op.decl [concrete = constants.%assoc0]
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = %Self
// CHECK:STDOUT: .Op = %assoc0
// CHECK:STDOUT: witness = (%I.Op.decl)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.Op(@I.%Self: %I.type) {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = %Self (constants.%Self.7ee)]
// CHECK:STDOUT: %Self.as_type.loc8_15.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc8_15.1 (constants.%Self.as_type.a67)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.as_type.loc8_15.1 [symbolic = %pattern_type (constants.%pattern_type.d22)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn(%self.param: @I.Op.%Self.as_type.loc8_15.1 (%Self.as_type.a67));
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.Op(constants.%Self.7ee) {
// CHECK:STDOUT: %Self => constants.%Self.7ee
// CHECK:STDOUT: %Self.as_type.loc8_15.1 => constants.%Self.as_type.a67
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.d22
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.Op(constants.%I.facet) {
// CHECK:STDOUT: %Self => constants.%I.facet
// CHECK:STDOUT: %Self.as_type.loc8_15.1 => constants.%C
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.c48
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_included.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.c48: type = pattern_type %C [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [concrete]
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic]
// CHECK:STDOUT: %I.assoc_type: type = assoc_entity_type @I [concrete]
// CHECK:STDOUT: %assoc0: %I.assoc_type = assoc_entity element0, imports.%Main.import_ref.7d9 [concrete]
// CHECK:STDOUT: %I.Op.type: type = fn_type @I.Op [concrete]
// CHECK:STDOUT: %I.Op: %I.Op.type = struct_value () [concrete]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic]
// CHECK:STDOUT: %pattern_type.d22: type = pattern_type %Self.as_type [symbolic]
// 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: %.2b2: type = fn_type_with_self_type %I.Op.type, %I.facet [concrete]
// CHECK:STDOUT: %C.as.I.impl.Op.type: type = fn_type @C.as.I.impl.Op [concrete]
// CHECK:STDOUT: %C.as.I.impl.Op: %C.as.I.impl.Op.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.I: type = import_ref Main//included_with_range, I, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: %Main.C: type = import_ref Main//included_with_range, C, loaded [concrete = constants.%C]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.8f2: <witness> = import_ref Main//included_with_range, loc16_1, loaded [concrete = constants.%complete_type]
// CHECK:STDOUT: %Main.import_ref.2c4 = import_ref Main//included_with_range, inst43 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.8e7 = import_ref Main//included_with_range, inst19 [no loc], unloaded
// CHECK:STDOUT: %Main.import_ref.9cd: %I.assoc_type = import_ref Main//included_with_range, loc8_22, loaded [concrete = constants.%assoc0]
// CHECK:STDOUT: %Main.Op = import_ref Main//included_with_range, Op, unloaded
// CHECK:STDOUT: %Main.import_ref.7d9: %I.Op.type = import_ref Main//included_with_range, loc8_22, loaded [concrete = constants.%I.Op]
// CHECK:STDOUT: %Main.import_ref.de2: %I.type = import_ref Main//included_with_range, inst19 [no loc], loaded [symbolic = constants.%Self]
// CHECK:STDOUT: %Main.import_ref.3a9: <witness> = import_ref Main//included_with_range, loc13_15, loaded [concrete = constants.%I.impl_witness]
// CHECK:STDOUT: %Main.import_ref.29a: type = import_ref Main//included_with_range, loc13_8, loaded [concrete = constants.%C]
// CHECK:STDOUT: %Main.import_ref.301: type = import_ref Main//included_with_range, loc13_13, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: %Main.import_ref.2a1: %C.as.I.impl.Op.type = import_ref Main//included_with_range, loc14_25, loaded [concrete = constants.%C.as.I.impl.Op]
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (%Main.import_ref.2a1), @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: .Core = imports.%Core
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %c.patt: %pattern_type.c48 = binding_pattern c [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type.c48 = value_param_pattern %c.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %c.param: %C = value_param call_param0
// CHECK:STDOUT: %C.ref: type = name_ref C, imports.%Main.C [concrete = constants.%C]
// CHECK:STDOUT: %c: %C = bind_name c, %c.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: interface @I [from "exclude/included_with_range.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.8e7
// CHECK:STDOUT: .Op = imports.%Main.import_ref.9cd
// CHECK:STDOUT: witness = (imports.%Main.Op)
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: impl @C.as.I.impl: imports.%Main.import_ref.29a as imports.%Main.import_ref.301 [from "exclude/included_with_range.carbon"] {
// CHECK:STDOUT: !members:
// CHECK:STDOUT: witness = imports.%Main.import_ref.3a9
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: class @C [from "exclude/included_with_range.carbon"] {
// CHECK:STDOUT: complete_type_witness = imports.%Main.import_ref.8f2
// CHECK:STDOUT:
// CHECK:STDOUT: !members:
// CHECK:STDOUT: .Self = imports.%Main.import_ref.2c4
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%c.param: %C) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %C = name_ref c, %c
// CHECK:STDOUT: %I.ref: type = name_ref I, imports.%Main.I [concrete = constants.%I.type]
// CHECK:STDOUT: %Op.ref: %I.assoc_type = name_ref Op, imports.%Main.import_ref.9cd [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0: %.2b2 = impl_witness_access constants.%I.impl_witness, element0 [concrete = constants.%C.as.I.impl.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %C.as.I.impl.Op.call: init %empty_tuple.type = call %bound_method(%c.ref)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: generic fn @I.Op(imports.%Main.import_ref.de2: %I.type) [from "exclude/included_with_range.carbon"] {
// CHECK:STDOUT: %Self: %I.type = bind_symbolic_name Self, 0 [symbolic = %Self (constants.%Self)]
// CHECK:STDOUT: %Self.as_type: type = facet_access_type %Self [symbolic = %Self.as_type (constants.%Self.as_type)]
// CHECK:STDOUT: %pattern_type: type = pattern_type %Self.as_type [symbolic = %pattern_type (constants.%pattern_type.d22)]
// CHECK:STDOUT:
// CHECK:STDOUT: fn;
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @C.as.I.impl.Op [from "exclude/included_with_range.carbon"];
// CHECK:STDOUT:
// CHECK:STDOUT: specific @I.Op(constants.%Self) {
// CHECK:STDOUT: %Self => constants.%Self
// CHECK:STDOUT: %Self.as_type => constants.%Self.as_type
// CHECK:STDOUT: %pattern_type => constants.%pattern_type.d22
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: --- import_excluded.carbon
// CHECK:STDOUT:
// CHECK:STDOUT: constants {
// CHECK:STDOUT: %C: type = class_type @C [concrete]
// CHECK:STDOUT: %pattern_type.c48: type = pattern_type %C [concrete]
// CHECK:STDOUT: %F.type: type = fn_type @F [concrete]
// CHECK:STDOUT: %empty_tuple.type: type = tuple_type () [concrete]
// CHECK:STDOUT: %F: %F.type = struct_value () [concrete]
// CHECK:STDOUT: %I.type: type = facet_type <@I> [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.7d9 [concrete]
// CHECK:STDOUT: %I.Op.type: type = fn_type @I.Op [concrete]
// CHECK:STDOUT: %I.Op: %I.Op.type = struct_value () [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: %.2b2: type = fn_type_with_self_type %I.Op.type, %I.facet [concrete]
// CHECK:STDOUT: %C.as.I.impl.Op.type: type = fn_type @C.as.I.impl.Op [concrete]
// CHECK:STDOUT: %C.as.I.impl.Op: %C.as.I.impl.Op.type = struct_value () [concrete]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: imports {
// CHECK:STDOUT: %Main.I: type = import_ref Main//excluded_with_range, I, loaded [concrete = constants.%I.type]
// CHECK:STDOUT: %Main.C: type = import_ref Main//excluded_with_range, C, loaded [concrete = constants.%C]
// CHECK:STDOUT: %Core: <namespace> = namespace file.%Core.import, [concrete] {
// CHECK:STDOUT: import Core//prelude
// CHECK:STDOUT: import Core//prelude/...
// CHECK:STDOUT: }
// CHECK:STDOUT: %Main.import_ref.9cd: %I.assoc_type = import_ref Main//excluded_with_range, loc6_22, loaded [concrete = constants.%assoc0]
// CHECK:STDOUT: %Main.import_ref.7d9: %I.Op.type = import_ref Main//excluded_with_range, loc6_22, loaded [concrete = constants.%I.Op]
// CHECK:STDOUT: %Main.import_ref.2a1: %C.as.I.impl.Op.type = import_ref Main//excluded_with_range, loc12_25, loaded [concrete = constants.%C.as.I.impl.Op]
// CHECK:STDOUT: %I.impl_witness_table = impl_witness_table (%Main.import_ref.2a1), @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: .Core = imports.%Core
// CHECK:STDOUT: .F = %F.decl
// CHECK:STDOUT: }
// CHECK:STDOUT: %Core.import = import Core
// CHECK:STDOUT: %default.import = import <none>
// CHECK:STDOUT: %F.decl: %F.type = fn_decl @F [concrete = constants.%F] {
// CHECK:STDOUT: %c.patt: %pattern_type.c48 = binding_pattern c [concrete]
// CHECK:STDOUT: %c.param_patt: %pattern_type.c48 = value_param_pattern %c.patt, call_param0 [concrete]
// CHECK:STDOUT: } {
// CHECK:STDOUT: %c.param: %C = value_param call_param0
// CHECK:STDOUT: %C.ref: type = name_ref C, imports.%Main.C [concrete = constants.%C]
// CHECK:STDOUT: %c: %C = bind_name c, %c.param
// CHECK:STDOUT: }
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @F(%c.param: %C) {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: %c.ref: %C = name_ref c, %c
// CHECK:STDOUT: %I.ref: type = name_ref I, imports.%Main.I [concrete = constants.%I.type]
// CHECK:STDOUT: %Op.ref: %I.assoc_type = name_ref Op, imports.%Main.import_ref.9cd [concrete = constants.%assoc0]
// CHECK:STDOUT: %impl.elem0: %.2b2 = impl_witness_access constants.%I.impl_witness, element0 [concrete = constants.%C.as.I.impl.Op]
// CHECK:STDOUT: %bound_method: <bound method> = bound_method %c.ref, %impl.elem0
// CHECK:STDOUT: %C.as.I.impl.Op.call: init %empty_tuple.type = call %bound_method(%c.ref)
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT:
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