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c5eba90317bfb81f4f22de9db149e79b7d6bc97d
carbon-lang/toolchain/lower/testdata/interop/cpp/pointer.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/full.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/pointer.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/pointer.carbon
// ============================================================================
// Non-null pointers
// ============================================================================
// --- nonnull.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
class C {};
auto TakePtr(C* _Nonnull) -> void;
auto ReturnPtr() -> C* _Nonnull;
auto TakePtrWithThunk(C* _Nonnull, int = 0) -> void;
auto ReturnPtrWithThunk(int = 0) -> C* _Nonnull;
''';
fn PassPtr(p: Cpp.C*) {
Cpp.TakePtr(p);
}
fn ReturnPtr() -> Cpp.C* {
return Cpp.ReturnPtr();
}
fn PassPtrWithThunk(p: Cpp.C*) {
Cpp.TakePtrWithThunk(p);
}
fn ReturnPtrWithThunk() -> Cpp.C* {
return Cpp.ReturnPtrWithThunk();
}
// ============================================================================
// Nullable pointers
// ============================================================================
// --- nullable.carbon
library "[[@TEST_NAME]]";
import Cpp inline '''
class C {};
auto TakePtr(C*) -> void;
auto ReturnPtr() -> C*;
auto TakePtrWithThunk(C*, int = 0) -> void;
auto ReturnPtrWithThunk(int = 0) -> C*;
''';
fn PassPtr(_: Core.Optional(Cpp.C*)) {
// TODO: Add support for passing an optional here.
// Cpp.TakePtr(p);
}
fn PassNonnullPtr(p: Cpp.C*) {
// TODO: The `value_of_initializer` optimization doesn't get used here, so we
// unnecessarily round-trip this value through memory.
Cpp.TakePtr(p);
}
fn ReturnPtr() -> Core.Optional(Cpp.C*) {
return Cpp.ReturnPtr();
}
fn PassPtrWithThunk(_: Core.Optional(Cpp.C*)) {
// TODO: Add support for passing an optional here.
// Cpp.TakePtrWithThunk(p);
}
fn PassNonnullPtrWithThunk(p: Cpp.C*) {
Cpp.TakePtrWithThunk(p);
}
fn ReturnPtrWithThunk() -> Core.Optional(Cpp.C*) {
return Cpp.ReturnPtrWithThunk();
}
// CHECK:STDOUT: ; ModuleID = 'nonnull.carbon'
// CHECK:STDOUT: source_filename = "nonnull.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassPtr.Main(ptr %p) #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z7TakePtrP1C(ptr %p), !dbg !13
// CHECK:STDOUT: ret void, !dbg !14
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z7TakePtrP1C(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnPtr.Main() #0 !dbg !15 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ReturnPtr.call = call ptr @_Z9ReturnPtrv(), !dbg !18
// CHECK:STDOUT: ret ptr %ReturnPtr.call, !dbg !19
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @_Z9ReturnPtrv()
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassPtrWithThunk.Main(ptr %p) #0 !dbg !20 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %p), !dbg !23
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnPtrWithThunk.Main() #0 !dbg !25 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ReturnPtrWithThunk__carbon_thunk.call = call ptr @_Z18ReturnPtrWithThunki.carbon_thunk0(), !dbg !26
// CHECK:STDOUT: ret ptr %ReturnPtrWithThunk__carbon_thunk.call, !dbg !27
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %0) #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8
// CHECK:STDOUT: call void @_Z16TakePtrWithThunkP1Ci(ptr %1, i32 0)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z16TakePtrWithThunkP1Ci(ptr, i32) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local ptr @_Z18ReturnPtrWithThunki.carbon_thunk0() #1 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %call = call ptr @_Z18ReturnPtrWithThunki(i32 0)
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @_Z18ReturnPtrWithThunki(i32) #2
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #2 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "nonnull.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassPtr", linkageName: "_CPassPtr.Main", scope: null, file: !6, line: 14, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{null, !10}
// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
// CHECK:STDOUT: !11 = !{!12}
// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
// CHECK:STDOUT: !13 = !DILocation(line: 15, column: 3, scope: !7)
// CHECK:STDOUT: !14 = !DILocation(line: 14, column: 1, scope: !7)
// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "ReturnPtr", linkageName: "_CReturnPtr.Main", scope: null, file: !6, line: 18, type: !16, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !16 = !DISubroutineType(types: !17)
// CHECK:STDOUT: !17 = !{!10}
// CHECK:STDOUT: !18 = !DILocation(line: 19, column: 10, scope: !15)
// CHECK:STDOUT: !19 = !DILocation(line: 19, column: 3, scope: !15)
// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "PassPtrWithThunk", linkageName: "_CPassPtrWithThunk.Main", scope: null, file: !6, line: 22, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !21)
// CHECK:STDOUT: !21 = !{!22}
// CHECK:STDOUT: !22 = !DILocalVariable(arg: 1, scope: !20, type: !10)
// CHECK:STDOUT: !23 = !DILocation(line: 23, column: 3, scope: !20)
// CHECK:STDOUT: !24 = !DILocation(line: 22, column: 1, scope: !20)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "ReturnPtrWithThunk", linkageName: "_CReturnPtrWithThunk.Main", scope: null, file: !6, line: 26, type: !16, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !26 = !DILocation(line: 27, column: 10, scope: !25)
// CHECK:STDOUT: !27 = !DILocation(line: 27, column: 3, scope: !25)
// CHECK:STDOUT: ; ModuleID = 'nullable.carbon'
// CHECK:STDOUT: source_filename = "nullable.carbon"
// CHECK:STDOUT: target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
// CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassPtr.Main(ptr %_) #0 !dbg !7 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !13
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassNonnullPtr.Main(ptr %p) #0 !dbg !14 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc22_15.2.temp = alloca ptr, align 8, !dbg !17
// CHECK:STDOUT: %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.Core.5b1b7c6bb83e5c41"(ptr %p), !dbg !17
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc22_15.2.temp), !dbg !17
// CHECK:STDOUT: store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc22_15.2.temp, align 8, !dbg !17
// CHECK:STDOUT: %.loc22_15.4 = load ptr, ptr %.loc22_15.2.temp, align 8, !dbg !17
// CHECK:STDOUT: call void @_Z7TakePtrP1C(ptr %.loc22_15.4), !dbg !18
// CHECK:STDOUT: ret void, !dbg !19
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z7TakePtrP1C(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnPtr.Main() #0 !dbg !20 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ReturnPtr.call = call ptr @_Z9ReturnPtrv(), !dbg !23
// CHECK:STDOUT: ret ptr %ReturnPtr.call, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @_Z9ReturnPtrv()
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassPtrWithThunk.Main(ptr %_) #0 !dbg !25 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CPassNonnullPtrWithThunk.Main(ptr %p) #0 !dbg !29 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc35_24.2.temp = alloca ptr, align 8, !dbg !32
// CHECK:STDOUT: %U.binding.as_type.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.Core.5b1b7c6bb83e5c41"(ptr %p), !dbg !32
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc35_24.2.temp), !dbg !32
// CHECK:STDOUT: store ptr %U.binding.as_type.as.ImplicitAs.impl.Convert.call, ptr %.loc35_24.2.temp, align 8, !dbg !32
// CHECK:STDOUT: %.loc35_24.4 = load ptr, ptr %.loc35_24.2.temp, align 8, !dbg !32
// CHECK:STDOUT: call void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %.loc35_24.4), !dbg !33
// CHECK:STDOUT: ret void, !dbg !34
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnPtrWithThunk.Main() #0 !dbg !35 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %ReturnPtrWithThunk__carbon_thunk.call = call ptr @_Z18ReturnPtrWithThunki.carbon_thunk0(), !dbg !36
// CHECK:STDOUT: ret ptr %ReturnPtrWithThunk__carbon_thunk.call, !dbg !37
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.Core.5b1b7c6bb83e5c41"(ptr %self) #0 !dbg !38 {
// CHECK:STDOUT: %1 = call ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.Core.ea71e3f17b6b4efb"(ptr %self), !dbg !44
// CHECK:STDOUT: ret ptr %1, !dbg !45
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.90961d7b1ce4f089:OptionalAs.Core.ea71e3f17b6b4efb"(ptr %self) #0 !dbg !46 {
// CHECK:STDOUT: %1 = call ptr @_CSome.Optional.Core.ea71e3f17b6b4efb(ptr %self), !dbg !49
// CHECK:STDOUT: ret ptr %1, !dbg !50
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @_CSome.Optional.Core.ea71e3f17b6b4efb(ptr %value) #0 !dbg !51 {
// CHECK:STDOUT: %1 = call ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655"(ptr %value), !dbg !54
// CHECK:STDOUT: ret ptr %1, !dbg !55
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @"_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655"(ptr %self) #0 !dbg !56 {
// CHECK:STDOUT: %1 = alloca ptr, align 8, !dbg !59
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %1), !dbg !59
// CHECK:STDOUT: store ptr %self, ptr %1, align 8, !dbg !60
// CHECK:STDOUT: %2 = load ptr, ptr %1, align 8, !dbg !61
// CHECK:STDOUT: ret ptr %2, !dbg !62
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local void @_Z16TakePtrWithThunkP1Ci.carbon_thunk1(ptr %0) #2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %0, ptr %.addr, align 8
// CHECK:STDOUT: %1 = load ptr, ptr %.addr, align 8
// CHECK:STDOUT: call void @_Z16TakePtrWithThunkP1Ci(ptr %1, i32 0)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z16TakePtrWithThunkP1Ci(ptr, i32) #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress
// CHECK:STDOUT: define dso_local ptr @_Z18ReturnPtrWithThunki.carbon_thunk0() #2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %call = call ptr @_Z18ReturnPtrWithThunki(i32 0)
// CHECK:STDOUT: ret ptr %call
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @_Z18ReturnPtrWithThunki(i32) #3
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_CConvert.e5cf8fcbb4feaae2:ImplicitAs.Core.5b1b7c6bb83e5c41", { 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 2, 1 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #3 = { "no-trapping-math"="true" "stack-protector-buffer-size"="0" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = !{i32 1, !"wchar_size", i32 4}
// CHECK:STDOUT: !3 = !{i32 8, !"PIC Level", i32 0}
// CHECK:STDOUT: !4 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !6 = !DIFile(filename: "nullable.carbon", directory: "")
// CHECK:STDOUT: !7 = distinct !DISubprogram(name: "PassPtr", linkageName: "_CPassPtr.Main", scope: null, file: !6, line: 14, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !11)
// CHECK:STDOUT: !8 = !DISubroutineType(types: !9)
// CHECK:STDOUT: !9 = !{null, !10}
// CHECK:STDOUT: !10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 8)
// CHECK:STDOUT: !11 = !{!12}
// CHECK:STDOUT: !12 = !DILocalVariable(arg: 1, scope: !7, type: !10)
// CHECK:STDOUT: !13 = !DILocation(line: 14, column: 1, scope: !7)
// CHECK:STDOUT: !14 = distinct !DISubprogram(name: "PassNonnullPtr", linkageName: "_CPassNonnullPtr.Main", scope: null, file: !6, line: 19, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !15)
// CHECK:STDOUT: !15 = !{!16}
// CHECK:STDOUT: !16 = !DILocalVariable(arg: 1, scope: !14, type: !10)
// CHECK:STDOUT: !17 = !DILocation(line: 22, column: 15, scope: !14)
// CHECK:STDOUT: !18 = !DILocation(line: 22, column: 3, scope: !14)
// CHECK:STDOUT: !19 = !DILocation(line: 19, column: 1, scope: !14)
// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "ReturnPtr", linkageName: "_CReturnPtr.Main", scope: null, file: !6, line: 25, type: !21, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !21 = !DISubroutineType(types: !22)
// CHECK:STDOUT: !22 = !{!10}
// CHECK:STDOUT: !23 = !DILocation(line: 26, column: 10, scope: !20)
// CHECK:STDOUT: !24 = !DILocation(line: 26, column: 3, scope: !20)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "PassPtrWithThunk", linkageName: "_CPassPtrWithThunk.Main", scope: null, file: !6, line: 29, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !26)
// CHECK:STDOUT: !26 = !{!27}
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !25, type: !10)
// CHECK:STDOUT: !28 = !DILocation(line: 29, column: 1, scope: !25)
// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "PassNonnullPtrWithThunk", linkageName: "_CPassNonnullPtrWithThunk.Main", scope: null, file: !6, line: 34, type: !8, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !30)
// CHECK:STDOUT: !30 = !{!31}
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !29, type: !10)
// CHECK:STDOUT: !32 = !DILocation(line: 35, column: 24, scope: !29)
// CHECK:STDOUT: !33 = !DILocation(line: 35, column: 3, scope: !29)
// CHECK:STDOUT: !34 = !DILocation(line: 34, column: 1, scope: !29)
// CHECK:STDOUT: !35 = distinct !DISubprogram(name: "ReturnPtrWithThunk", linkageName: "_CReturnPtrWithThunk.Main", scope: null, file: !6, line: 38, type: !21, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !36 = !DILocation(line: 39, column: 10, scope: !35)
// CHECK:STDOUT: !37 = !DILocation(line: 39, column: 3, scope: !35)
// CHECK:STDOUT: !38 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.e5cf8fcbb4feaae2:ImplicitAs.Core.5b1b7c6bb83e5c41", scope: null, file: !39, line: 82, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !42)
// CHECK:STDOUT: !39 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
// CHECK:STDOUT: !40 = !DISubroutineType(types: !41)
// CHECK:STDOUT: !41 = !{!10, !10}
// CHECK:STDOUT: !42 = !{!43}
// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !38, type: !10)
// CHECK:STDOUT: !44 = !DILocation(line: 83, column: 12, scope: !38)
// CHECK:STDOUT: !45 = !DILocation(line: 83, column: 5, scope: !38)
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.90961d7b1ce4f089:OptionalAs.Core.ea71e3f17b6b4efb", scope: null, file: !39, line: 68, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !47)
// CHECK:STDOUT: !47 = !{!48}
// CHECK:STDOUT: !48 = !DILocalVariable(arg: 1, scope: !46, type: !10)
// CHECK:STDOUT: !49 = !DILocation(line: 69, column: 12, scope: !46)
// CHECK:STDOUT: !50 = !DILocation(line: 69, column: 5, scope: !46)
// CHECK:STDOUT: !51 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.Optional.Core.ea71e3f17b6b4efb", scope: null, file: !39, line: 29, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !52)
// CHECK:STDOUT: !52 = !{!53}
// CHECK:STDOUT: !53 = !DILocalVariable(arg: 1, scope: !51, type: !10)
// CHECK:STDOUT: !54 = !DILocation(line: 30, column: 12, scope: !51)
// CHECK:STDOUT: !55 = !DILocation(line: 30, column: 5, scope: !51)
// CHECK:STDOUT: !56 = distinct !DISubprogram(name: "Some", linkageName: "_CSome.e8f8f92d3d08d149:OptionalStorage.Core.f53db17714b9f655", scope: null, file: !39, line: 125, type: !40, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !57)
// CHECK:STDOUT: !57 = !{!58}
// CHECK:STDOUT: !58 = !DILocalVariable(arg: 1, scope: !56, type: !10)
// CHECK:STDOUT: !59 = !DILocation(line: 126, column: 14, scope: !56)
// CHECK:STDOUT: !60 = !DILocation(line: 127, column: 5, scope: !56)
// CHECK:STDOUT: !61 = !DILocation(line: 126, column: 18, scope: !56)
// CHECK:STDOUT: !62 = !DILocation(line: 128, column: 5, scope: !56)
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