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carbon-lang/toolchain/lower/testdata/interop/cpp/nullptr.carbon
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Dana Jansens 4261bb2dd2 Track and don't replace active .Self (#7443) 
In #7436 we stopped substituting `.Self` when collecting witnesses out
of a facet type. While this was correct, it did not capture all the
cases that need to avoid substituting `.Self`. And it poisoned the
`IdentifiedFacetType` cache by not replacing `.Self` but storing the
result in the cache. This led to incoherent behaviour, where the result
of an impl lookup would change depending on which ones had been done
previously.

Now we use a flag to track for each `.Self` if we're currently
type-checking inside the scope where it was introduced in a facet type.
While inside that scope, identify should not replace the `.Self`. Any
use of it should remain as-is since we don't yet know what value will
replace it. We call this state "frozen" since it should not be modified
by identify. This requires a substitution step when we leave the scope
that introduced the `.Self`, to remove the flag. The flag is set in the
`EntityName` of the `SymbolicBinding`, and is part of the canonical
value, since `.Self` can become part of types, which are constants, and
the flag needs to follow it for correct behaviour.

We also have to ensure the flag is the same when doing comparison with
constants from inside a facet type and constants from outside. For
instance in `(Z where .Z1 = ()) where .Z2 = .Z1`, when we arrive at the
second `.Z1` its `.Self` will be frozen, while the `.Z1 = ()` contains a
non-frozen `.Self`. So we add the frozen flag to the first when storing
it in `where_stack` in order to compare the constant values of the two
`.Z1`.

The `WhereExpr` requirement inst kinds now have an `InstConstantKind` of
`AlwaysUnique` instead of `Never`. This allows us to add them to the
usual InstBlocks, and in an `eval fn` body they have a constant value,
so eval does not fail when trying to call that function. We have to be
careful to not consider `AlwaysUnique` as being actually concrete
though, since their constant value erases `.Self`-dependence. This
allows us to stop special casing them when thawing the requirements
block in a `WhereExpr`, and we can just thaw each `InstId` in the block
in a straightforward manner.

We add the new flag to the instruction's fingerprint and name in
formatted semir.
2026-07-08 18:04:56 +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 !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_18.2.temp = alloca ptr, align 8, !dbg !14
// CHECK:STDOUT: %.loc14_22.1.temp = alloca ptr, align 8, !dbg !15
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.f8357062f5b0e57c.Core.84588f41d61dafba"(ptr poison), !dbg !14
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc12_18.2.temp), !dbg !14
// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, ptr %.loc12_18.2.temp, align 8, !dbg !14
// CHECK:STDOUT: %.loc12_18.4 = load ptr, ptr %.loc12_18.2.temp, align 8, !dbg !14
// CHECK:STDOUT: call void @_Z7TakePtrPi(ptr %.loc12_18.4), !dbg !16
// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !15
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc14_22.1.temp), !dbg !15
// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, ptr %.loc14_22.1.temp, align 8, !dbg !15
// CHECK:STDOUT: call void @_Z11TakeNullptrDn.carbon_thunk._(ptr %.loc14_22.1.temp), !dbg !17
// CHECK:STDOUT: call void @"_COp.37a0be3fec6961f4:core.Destroy.Core"(ptr %.loc14_22.1.temp), !dbg !15
// CHECK:STDOUT: call void @"_COp.9a41840f34ccc47a:core.Destroy.Core"(ptr %.loc12_18.2.temp), !dbg !14
// CHECK:STDOUT: ret void, !dbg !18
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: declare void @_Z7TakePtrPi(ptr noundef) #1
// 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 !19
// CHECK:STDOUT: %0 = load ptr, ptr %n.addr, align 8, !tbaa !19
// 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.fd39a15e7d61228d:core.Destroy.Core"(ptr %self) #0 !dbg !22 {
// 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.125695b29f2cf97c:core.Destroy.Core"(ptr %self) #0 !dbg !29 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !32
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.37a0be3fec6961f4:core.Destroy.Core"(ptr %self) #0 !dbg !33 {
// 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.32a070744df634d9:core.Destroy.Core"(ptr %self) #0 !dbg !37 {
// 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.958634845f762cfe:core.Destroy.Core"(ptr %self) #0 !dbg !41 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !44
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.9a41840f34ccc47a:core.Destroy.Core"(ptr %self) #0 !dbg !45 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !48
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnNullptr.Main() #0 !dbg !49 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !52
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, !dbg !53
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnNullptrCopy.Main() #0 !dbg !54 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %a.var = alloca ptr, align 8, !dbg !55
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !55
// CHECK:STDOUT: %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !56
// CHECK:STDOUT: store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22, ptr %a.var, align 8, !dbg !55
// 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.37a0be3fec6961f4:core.Destroy.Core"(ptr %a.var), !dbg !55
// 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 !60
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !60
// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk.(ptr %a.var), !dbg !61
// CHECK:STDOUT: %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !62
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.f8357062f5b0e57c.Core.84588f41d61dafba"(ptr %.loc28_10), !dbg !63
// CHECK:STDOUT: call void @"_COp.37a0be3fec6961f4:core.Destroy.Core"(ptr %a.var), !dbg !60
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !63
// 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 !19
// CHECK:STDOUT: %0 = load ptr, ptr %return.addr, align 8, !tbaa !19
// CHECK:STDOUT: %call = call ptr @_Z13ReturnNullptrv()
// CHECK:STDOUT: store ptr %call, ptr %0, align 8, !tbaa !64
// CHECK:STDOUT: ret void
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CReturnConvertedNullptrDirectly.Main() #0 !dbg !66 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc32_28.1.temp = alloca ptr, align 8, !dbg !67
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !67
// CHECK:STDOUT: call void @_Z13ReturnNullptrv.carbon_thunk.(ptr %.loc32_28.1.temp), !dbg !67
// CHECK:STDOUT: %.loc32_28.4 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !67
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.f8357062f5b0e57c.Core.84588f41d61dafba"(ptr %.loc32_28.4), !dbg !68
// CHECK:STDOUT: call void @"_COp.37a0be3fec6961f4:core.Destroy.Core"(ptr %.loc32_28.1.temp), !dbg !67
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !68
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #0 !dbg !69 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.f8357062f5b0e57c.Core.84588f41d61dafba"(ptr poison), !dbg !70
// CHECK:STDOUT: ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !70
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.f8357062f5b0e57c.Core.84588f41d61dafba"(ptr %self) #0 !dbg !71 {
// CHECK:STDOUT: %1 = call ptr @_CNone.Optional.Core.0a6122c87ac9ba0f(), !dbg !77
// CHECK:STDOUT: ret ptr %1, !dbg !78
// 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.0a6122c87ac9ba0f() #0 !dbg !79 {
// CHECK:STDOUT: ret ptr null, !dbg !81
// 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.f8357062f5b0e57c.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 = !{!0}
// CHECK:STDOUT: !llvm.module.flags = !{!2, !3, !4, !5, !6}
// CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !1 = !DIFile(filename: "simple.carbon", directory: "")
// CHECK:STDOUT: !2 = !{i32 8, !"PIC Level", i32 2}
// CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
// CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
// CHECK:STDOUT: !5 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !6 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !7 = !{!8, !8, i64 0}
// CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
// CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
// CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "PassNullptr", linkageName: "_CPassNullptr.Main", scope: null, file: !1, line: 11, type: !12, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !12 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !13 = !{null}
// CHECK:STDOUT: !14 = !DILocation(line: 12, column: 15, scope: !11)
// CHECK:STDOUT: !15 = !DILocation(line: 14, column: 19, scope: !11)
// CHECK:STDOUT: !16 = !DILocation(line: 12, column: 3, scope: !11)
// CHECK:STDOUT: !17 = !DILocation(line: 14, column: 3, scope: !11)
// CHECK:STDOUT: !18 = !DILocation(line: 11, column: 1, scope: !11)
// CHECK:STDOUT: !19 = !{!20, !20, i64 0}
// CHECK:STDOUT: !20 = !{!"p1 std::nullptr_t", !21, i64 0}
// CHECK:STDOUT: !21 = !{!"any pointer", !9, i64 0}
// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "Op", linkageName: "_COp.fd39a15e7d61228d:core.Destroy.Core", scope: null, file: !1, line: 14, type: !23, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !26)
// CHECK:STDOUT: !23 = !DISubroutineType(types: !24)
// CHECK:STDOUT: !24 = !{null, !25}
// CHECK:STDOUT: !25 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !26 = !{!27}
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !22, type: !25)
// CHECK:STDOUT: !28 = !DILocation(line: 14, column: 19, scope: !22)
// CHECK:STDOUT: !29 = distinct !DISubprogram(name: "Op", linkageName: "_COp.125695b29f2cf97c:core.Destroy.Core", scope: null, file: !1, line: 14, type: !23, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !30)
// CHECK:STDOUT: !30 = !{!31}
// CHECK:STDOUT: !31 = !DILocalVariable(arg: 1, scope: !29, type: !25)
// CHECK:STDOUT: !32 = !DILocation(line: 14, column: 19, scope: !29)
// CHECK:STDOUT: !33 = distinct !DISubprogram(name: "Op", linkageName: "_COp.37a0be3fec6961f4:core.Destroy.Core", scope: null, file: !1, line: 14, type: !23, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !34)
// CHECK:STDOUT: !34 = !{!35}
// CHECK:STDOUT: !35 = !DILocalVariable(arg: 1, scope: !33, type: !25)
// CHECK:STDOUT: !36 = !DILocation(line: 14, column: 19, scope: !33)
// CHECK:STDOUT: !37 = distinct !DISubprogram(name: "Op", linkageName: "_COp.32a070744df634d9:core.Destroy.Core", scope: null, file: !1, line: 12, type: !23, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !38)
// CHECK:STDOUT: !38 = !{!39}
// CHECK:STDOUT: !39 = !DILocalVariable(arg: 1, scope: !37, type: !25)
// CHECK:STDOUT: !40 = !DILocation(line: 12, column: 15, scope: !37)
// CHECK:STDOUT: !41 = distinct !DISubprogram(name: "Op", linkageName: "_COp.958634845f762cfe:core.Destroy.Core", scope: null, file: !1, line: 12, type: !23, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !42)
// CHECK:STDOUT: !42 = !{!43}
// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !41, type: !25)
// CHECK:STDOUT: !44 = !DILocation(line: 12, column: 15, scope: !41)
// CHECK:STDOUT: !45 = distinct !DISubprogram(name: "Op", linkageName: "_COp.9a41840f34ccc47a:core.Destroy.Core", scope: null, file: !1, line: 12, type: !23, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !46)
// CHECK:STDOUT: !46 = !{!47}
// CHECK:STDOUT: !47 = !DILocalVariable(arg: 1, scope: !45, type: !25)
// CHECK:STDOUT: !48 = !DILocation(line: 12, column: 15, scope: !45)
// CHECK:STDOUT: !49 = distinct !DISubprogram(name: "ReturnNullptr", linkageName: "_CReturnNullptr.Main", scope: null, file: !1, line: 17, type: !50, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !50 = !DISubroutineType(types: !51)
// CHECK:STDOUT: !51 = !{!25}
// CHECK:STDOUT: !52 = !DILocation(line: 18, column: 10, scope: !49)
// CHECK:STDOUT: !53 = !DILocation(line: 18, column: 3, scope: !49)
// CHECK:STDOUT: !54 = distinct !DISubprogram(name: "ReturnNullptrCopy", linkageName: "_CReturnNullptrCopy.Main", scope: null, file: !1, line: 21, type: !50, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !55 = !DILocation(line: 22, column: 3, scope: !54)
// CHECK:STDOUT: !56 = !DILocation(line: 22, column: 26, scope: !54)
// CHECK:STDOUT: !57 = !DILocation(line: 23, column: 10, scope: !54)
// CHECK:STDOUT: !58 = !DILocation(line: 23, column: 3, scope: !54)
// CHECK:STDOUT: !59 = distinct !DISubprogram(name: "ReturnConvertedNullptrIndirectly", linkageName: "_CReturnConvertedNullptrIndirectly.Main", scope: null, file: !1, line: 26, type: !50, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !60 = !DILocation(line: 27, column: 3, scope: !59)
// CHECK:STDOUT: !61 = !DILocation(line: 27, column: 26, scope: !59)
// CHECK:STDOUT: !62 = !DILocation(line: 28, column: 10, scope: !59)
// CHECK:STDOUT: !63 = !DILocation(line: 28, column: 3, scope: !59)
// CHECK:STDOUT: !64 = !{!65, !65, i64 0}
// CHECK:STDOUT: !65 = !{!"std::nullptr_t", !9, i64 0}
// CHECK:STDOUT: !66 = distinct !DISubprogram(name: "ReturnConvertedNullptrDirectly", linkageName: "_CReturnConvertedNullptrDirectly.Main", scope: null, file: !1, line: 31, type: !50, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !67 = !DILocation(line: 32, column: 10, scope: !66)
// CHECK:STDOUT: !68 = !DILocation(line: 32, column: 3, scope: !66)
// CHECK:STDOUT: !69 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !1, line: 35, type: !50, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !70 = !DILocation(line: 36, column: 3, scope: !69)
// CHECK:STDOUT: !71 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.f8357062f5b0e57c.Core.84588f41d61dafba", scope: null, file: !72, line: 51, type: !73, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !75)
// CHECK:STDOUT: !72 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
// CHECK:STDOUT: !73 = !DISubroutineType(types: !74)
// CHECK:STDOUT: !74 = !{!25, !25}
// CHECK:STDOUT: !75 = !{!76}
// CHECK:STDOUT: !76 = !DILocalVariable(arg: 1, scope: !71, type: !25)
// CHECK:STDOUT: !77 = !DILocation(line: 52, column: 14, scope: !71)
// CHECK:STDOUT: !78 = !DILocation(line: 52, column: 7, scope: !71)
// CHECK:STDOUT: !79 = distinct !DISubprogram(name: "None", linkageName: "_CNone.Optional.Core.0a6122c87ac9ba0f", scope: null, file: !80, line: 30, type: !50, spFlags: DISPFlagDefinition, unit: !0)
// CHECK:STDOUT: !80 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
// CHECK:STDOUT: !81 = !DILocation(line: 31, column: 5, scope: !79)
// CHECK:STDOUT:
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