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carbon-lang/toolchain/lower/testdata/interop/cpp/nullptr.carbon
T
Dana Jansens 4416f3525b Canonicalize generated functions for Core witnesses (#7729) 
Use a single `SemIR::Function` per `Core` interface method, whether it's
generated locally or imported. This prevents generating duplicate
functions, which lead to different types when the witness appears in a
`FacetValue` as part of a specific for a class.

We use a `CanonicalValueStore` of `GeneratedFunction` objects that allow
finding an existing FunctionId for a `Generated` special function before
(re-)generating it. Mangling for `Generated` functions is also moved to
use the values from the `GeneratedFunction`'s canonicalization key, so
that we have a consistent source of truth for the unique ID of a
`Generated` function across all files.

New tests are in
`toolchain/check/testdata/impl/custom_witness/destroy.carbon`.
2026-09-15 16:02:13 +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/nullptr.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/nullptr.carbon
// --- simple.carbon
import Cpp inline '''
using nullptr_t = decltype(nullptr);
void TakePtr(int *p);
void TakeNullptr(nullptr_t n);
nullptr_t ReturnNullptr();
''';
fn PassNullptr() {
Cpp.TakePtr(Cpp.nullptr);
Cpp.TakeNullptr(Cpp.nullptr);
}
fn ReturnNullptr() -> Cpp.nullptr_t {
return Cpp.nullptr;
}
fn ReturnNullptrCopy() -> Cpp.nullptr_t {
var a: Cpp.nullptr_t = Cpp.nullptr;
return a;
}
fn ReturnConvertedNullptrIndirectly() -> Core.Optional(i32*) {
var a: Cpp.nullptr_t = Cpp.ReturnNullptr();
return a;
}
fn ReturnConvertedNullptrDirectly() -> Core.Optional(i32*) {
return Cpp.ReturnNullptr();
}
fn ConvertNullptrConstant() -> Core.Optional(i32*) {
return Cpp.nullptr;
}
// CHECK:STDOUT: ; ---
// CHECK:STDOUT: ; ModuleID = 'simple.carbon'
// CHECK:STDOUT: source_filename = "simple.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 @_CPassNullptr.Main() #0 !dbg !16 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_18.2.temp = alloca ptr, align 8, !dbg !17
// CHECK:STDOUT: %.loc14_22.1.temp = alloca ptr, align 8, !dbg !19
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.49279a15ecfc119b.Core.84588f41d61dafba"(ptr poison), !dbg !17
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc12_18.2.temp), !dbg !17
// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, ptr %.loc12_18.2.temp, align 8, !dbg !17
// CHECK:STDOUT: %.loc12_18.4 = load ptr, ptr %.loc12_18.2.temp, align 8, !dbg !17
// CHECK:STDOUT: call void @_Z7TakePtrPi(ptr %.loc12_18.4), !dbg !18
// CHECK:STDOUT: call void @"_COp.5b309895020f658e:core.Destroy.Core"(ptr %.loc12_18.2.temp), !dbg !17
// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !19
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc14_22.1.temp), !dbg !19
// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, ptr %.loc14_22.1.temp, align 8, !dbg !19
// CHECK:STDOUT: call void @_Z11TakeNullptrDn.carbon_thunk._(ptr %.loc14_22.1.temp), !dbg !20
// CHECK:STDOUT: call void @"_COp.826ebaace97974ae:core.Destroy.Core"(ptr %.loc14_22.1.temp), !dbg !19
// CHECK:STDOUT: ret void, !dbg !21
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z7TakePtrPi(ptr noundef) #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.0f866e2c9731ba7d:core.Destroy.Core"(ptr %self) #0 !dbg !22 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.6204fc8d2f2baaa7:core.Destroy.Core"(ptr %self) #0 !dbg !26 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.5b309895020f658e:core.Destroy.Core"(ptr %self) #0 !dbg !30 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !32
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_Z11TakeNullptrDn.carbon_thunk._(ptr noundef %n) #2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %n.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %n, ptr %n.addr, align 8, !tbaa !96
// CHECK:STDOUT: %0 = load ptr, ptr %n.addr, align 8, !tbaa !96
// CHECK:STDOUT: call void @_Z11TakeNullptrDn(ptr null)
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr)
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.a7d1b77eb1279818:core.Destroy.Core"(ptr %self) #0 !dbg !34 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !36
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.ddbd3dbdb388ab25:core.Destroy.Core"(ptr %self) #0 !dbg !38 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !40
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.826ebaace97974ae:core.Destroy.Core"(ptr %self) #0 !dbg !42 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnNullptr.Main() #0 !dbg !46 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !49
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, !dbg !50
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnNullptrCopy.Main() #0 !dbg !51 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !54
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !54
// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !55
// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22, ptr %a.var, align 8, !dbg !54
// CHECK:STDOUT: %.loc23 = load ptr, ptr %a.var, align 8, !dbg !57
// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr %.loc23), !dbg !57
// CHECK:STDOUT: call void @"_COp.826ebaace97974ae:core.Destroy.Core"(ptr %a.var), !dbg !54
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23, !dbg !58
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrIndirectly.Main() #0 !dbg !59 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !62
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !62
// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk.(ptr %a.var), !dbg !63
// CHECK:STDOUT: %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !65
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.49279a15ecfc119b.Core.84588f41d61dafba"(ptr %.loc28_10), !dbg !66
// CHECK:STDOUT: call void @"_COp.826ebaace97974ae:core.Destroy.Core"(ptr %a.var), !dbg !62
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !66
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
// CHECK:STDOUT: define internal void @_Z13ReturnNullptrv.carbon_thunk.(ptr noundef %return) #2 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %return.addr = alloca ptr, align 8
// CHECK:STDOUT: store ptr %return, ptr %return.addr, align 8, !tbaa !96
// CHECK:STDOUT: %0 = load ptr, ptr %return.addr, align 8, !tbaa !96
// CHECK:STDOUT: %call = call ptr @_Z13ReturnNullptrv()
// CHECK:STDOUT: store ptr %call, ptr %0, align 8, !tbaa !97
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrDirectly.Main() #0 !dbg !67 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc32_28.1.temp = alloca ptr, align 8, !dbg !70
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !70
// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk.(ptr %.loc32_28.1.temp), !dbg !70
// CHECK:STDOUT: %.loc32_28.4 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !70
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.49279a15ecfc119b.Core.84588f41d61dafba"(ptr %.loc32_28.4), !dbg !71
// CHECK:STDOUT: call void @"_COp.826ebaace97974ae:core.Destroy.Core"(ptr %.loc32_28.1.temp), !dbg !70
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !71
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #0 !dbg !72 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.49279a15ecfc119b.Core.84588f41d61dafba"(ptr poison), !dbg !75
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !75
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.49279a15ecfc119b.Core.84588f41d61dafba"(ptr %self) #0 !dbg !77 {
// CHECK:STDOUT: %1 = call ptr @_CNone.Optional.Core.6e9e957697159b53(), !dbg !82
// CHECK:STDOUT: ret ptr %1, !dbg !83
// 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)) #3
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @_CMake.NullptrT.CppCompat.Core()
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @_CNone.Optional.Core.6e9e957697159b53() #0 !dbg !86 {
// CHECK:STDOUT: ret ptr null, !dbg !90
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z11TakeNullptrDn(ptr) #1
// CHECK:STDOUT:
// CHECK:STDOUT: declare ptr @_Z13ReturnNullptrv() #1
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.49279a15ecfc119b.Core.84588f41d61dafba", { 3, 2, 1, 0 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #2 = { alwaysinline mustprogress uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
// CHECK:STDOUT: attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.dbg.cu = !{!5}
// CHECK:STDOUT: !llvm.module.flags = !{!98, !99, !100, !2, !3}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!103}
// CHECK:STDOUT:
// CHECK:STDOUT: !2 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !3 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !4 = !DIFile(filename: "simple.carbon", directory: "")
// CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !7 = !{null}
// CHECK:STDOUT: !8 = !DISubroutineType(types: !7)
// CHECK:STDOUT: !9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !10 = !{null, !9}
// CHECK:STDOUT: !11 = !DISubroutineType(types: !10)
// CHECK:STDOUT: !12 = !{!9, !9}
// CHECK:STDOUT: !13 = !DISubroutineType(types: !12)
// CHECK:STDOUT: !14 = !{!9}
// CHECK:STDOUT: !15 = !DISubroutineType(types: !14)
// CHECK:STDOUT: !16 = distinct !DISubprogram(name: "PassNullptr", linkageName: "_CPassNullptr.Main", scope: null, file: !4, line: 11, type: !8, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !17 = !DILocation(line: 12, column: 15, scope: !16)
// CHECK:STDOUT: !18 = !DILocation(line: 12, column: 3, scope: !16)
// CHECK:STDOUT: !19 = !DILocation(line: 14, column: 19, scope: !16)
// CHECK:STDOUT: !20 = !DILocation(line: 14, column: 3, scope: !16)
// CHECK:STDOUT: !21 = !DILocation(line: 11, column: 1, scope: !16)
// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "Op", linkageName: "_COp.0f866e2c9731ba7d:core.Destroy.Core", scope: null, file: !4, line: 12, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !25)
// CHECK:STDOUT: !23 = !DILocalVariable(arg: 1, scope: !22, type: !9)
// CHECK:STDOUT: !24 = !DILocation(line: 12, column: 15, scope: !22)
// CHECK:STDOUT: !25 = !{!23}
// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "Op", linkageName: "_COp.6204fc8d2f2baaa7:core.Destroy.Core", scope: null, file: !4, line: 12, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !29)
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !26, type: !9)
// CHECK:STDOUT: !28 = !DILocation(line: 12, column: 15, scope: !26)
// CHECK:STDOUT: !29 = !{!27}
// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "Op", linkageName: "_COp.5b309895020f658e:core.Destroy.Core", scope: null, file: !4, line: 12, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !33)
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !30, type: !9)
// CHECK:STDOUT: !32 = !DILocation(line: 12, column: 15, scope: !30)
// CHECK:STDOUT: !33 = !{!31}
// CHECK:STDOUT: !34 = distinct !DISubprogram(name: "Op", linkageName: "_COp.a7d1b77eb1279818:core.Destroy.Core", scope: null, file: !4, line: 14, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !37)
// CHECK:STDOUT: !35 = !DILocalVariable(arg: 1, scope: !34, type: !9)
// CHECK:STDOUT: !36 = !DILocation(line: 14, column: 19, scope: !34)
// CHECK:STDOUT: !37 = !{!35}
// CHECK:STDOUT: !38 = distinct !DISubprogram(name: "Op", linkageName: "_COp.ddbd3dbdb388ab25:core.Destroy.Core", scope: null, file: !4, line: 14, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !41)
// CHECK:STDOUT: !39 = !DILocalVariable(arg: 1, scope: !38, type: !9)
// CHECK:STDOUT: !40 = !DILocation(line: 14, column: 19, scope: !38)
// CHECK:STDOUT: !41 = !{!39}
// CHECK:STDOUT: !42 = distinct !DISubprogram(name: "Op", linkageName: "_COp.826ebaace97974ae:core.Destroy.Core", scope: null, file: !4, line: 14, type: !11, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !45)
// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !42, type: !9)
// CHECK:STDOUT: !44 = !DILocation(line: 14, column: 19, scope: !42)
// CHECK:STDOUT: !45 = !{!43}
// CHECK:STDOUT: !46 = distinct !DISubprogram(name: "ReturnNullptr", linkageName: "_CReturnNullptr.Main", scope: null, file: !4, line: 17, type: !15, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !49 = !DILocation(line: 18, column: 10, scope: !46)
// CHECK:STDOUT: !50 = !DILocation(line: 18, column: 3, scope: !46)
// CHECK:STDOUT: !51 = distinct !DISubprogram(name: "ReturnNullptrCopy", linkageName: "_CReturnNullptrCopy.Main", scope: null, file: !4, line: 21, type: !15, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !54 = !DILocation(line: 22, column: 3, scope: !51)
// CHECK:STDOUT: !55 = !DILocation(line: 22, column: 26, scope: !51)
// CHECK:STDOUT: !57 = !DILocation(line: 23, column: 10, scope: !51)
// CHECK:STDOUT: !58 = !DILocation(line: 23, column: 3, scope: !51)
// CHECK:STDOUT: !59 = distinct !DISubprogram(name: "ReturnConvertedNullptrIndirectly", linkageName: "_CReturnConvertedNullptrIndirectly.Main", scope: null, file: !4, line: 26, type: !15, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !62 = !DILocation(line: 27, column: 3, scope: !59)
// CHECK:STDOUT: !63 = !DILocation(line: 27, column: 26, scope: !59)
// CHECK:STDOUT: !65 = !DILocation(line: 28, column: 10, scope: !59)
// CHECK:STDOUT: !66 = !DILocation(line: 28, column: 3, scope: !59)
// CHECK:STDOUT: !67 = distinct !DISubprogram(name: "ReturnConvertedNullptrDirectly", linkageName: "_CReturnConvertedNullptrDirectly.Main", scope: null, file: !4, line: 31, type: !15, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !70 = !DILocation(line: 32, column: 10, scope: !67)
// CHECK:STDOUT: !71 = !DILocation(line: 32, column: 3, scope: !67)
// CHECK:STDOUT: !72 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !4, line: 35, type: !15, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !75 = !DILocation(line: 36, column: 3, scope: !72)
// CHECK:STDOUT: !76 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
// CHECK:STDOUT: !77 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.49279a15ecfc119b.Core.84588f41d61dafba", scope: null, file: !76, line: 51, type: !13, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !84)
// CHECK:STDOUT: !78 = !DILocalVariable(arg: 1, scope: !77, type: !9)
// CHECK:STDOUT: !82 = !DILocation(line: 52, column: 14, scope: !77)
// CHECK:STDOUT: !83 = !DILocation(line: 52, column: 7, scope: !77)
// CHECK:STDOUT: !84 = !{!78}
// CHECK:STDOUT: !85 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
// CHECK:STDOUT: !86 = distinct !DISubprogram(name: "None", linkageName: "_CNone.Optional.Core.6e9e957697159b53", scope: null, file: !85, line: 30, type: !15, spFlags: DISPFlagDefinition, unit: !5)
// CHECK:STDOUT: !90 = !DILocation(line: 31, column: 5, scope: !86)
// CHECK:STDOUT: !91 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !92 = !{!"omnipotent char", !91, i64 0}
// CHECK:STDOUT: !93 = !{!"std::nullptr_t", !92, i64 0}
// CHECK:STDOUT: !94 = !{!"any pointer", !92, i64 0}
// CHECK:STDOUT: !95 = !{!"p1 std::nullptr_t", !94, i64 0}
// CHECK:STDOUT: !96 = !{!95, !95, i64 0}
// CHECK:STDOUT: !97 = !{!93, !93, i64 0}
// CHECK:STDOUT: !98 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !99 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !100 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !101 = !{!"int", !92, i64 0}
// CHECK:STDOUT: !102 = !{!"__libc_errno", !101, i64 0}
// CHECK:STDOUT: !103 = !{!102, !101, i64 0}
// CHECK:STDOUT:
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