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carbon-lang
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toolchain
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lower
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testdata
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interop
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cpp
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nullptr.carbon

nullptr.carbon 16 KB
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  1. // Part of the Carbon Language project, under the Apache License v2.0 with LLVM
    2. 

  2. // Exceptions. See /LICENSE for license information.
    3. 

  3. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
    4. 

  4. //
    5. 

  5. // INCLUDE-FILE: toolchain/testing/testdata/min_prelude/full.carbon
    6. 

  6. //
    7. 

  7. // AUTOUPDATE
    8. 

  8. // TIP: To test this file alone, run:
    9. 

  9. // TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/interop/cpp/nullptr.carbon
    10. 

  10. // TIP: To dump output, run:
    11. 

  11. // TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/interop/cpp/nullptr.carbon
    12. 

  12. 

  13. // --- simple.carbon
    14. 

  14. 

  15. import Cpp inline '''
    16. 

  16. using nullptr_t = decltype(nullptr);
    17. 

  17. 

  18. void TakePtr(int *p);
    19. 

  19. void TakeNullptr(nullptr_t n);
    20. 

  20. 

  21. nullptr_t ReturnNullptr();
    22. 

  22. ''';
    23. 

  23. 

  24. fn PassNullptr() {
    25. 

  25.   Cpp.TakePtr(Cpp.nullptr);
    26. 

  26. 

  27.   Cpp.TakeNullptr(Cpp.nullptr);
    28. 

  28. }
    29. 

  29. 

  30. fn ReturnNullptr() -> Cpp.nullptr_t {
    31. 

  31.   return Cpp.nullptr;
    32. 

  32. }
    33. 

  33. 

  34. fn ReturnNullptrCopy() -> Cpp.nullptr_t {
    35. 

  35.   var a: Cpp.nullptr_t = Cpp.nullptr;
    36. 

  36.   return a;
    37. 

  37. }
    38. 

  38. 

  39. fn ReturnConvertedNullptrIndirectly() -> Core.Optional(i32*) {
    40. 

  40.   var a: Cpp.nullptr_t = Cpp.ReturnNullptr();
    41. 

  41.   return a;
    42. 

  42. }
    43. 

  43. 

  44. fn ReturnConvertedNullptrDirectly() -> Core.Optional(i32*) {
    45. 

  45.   return Cpp.ReturnNullptr();
    46. 

  46. }
    47. 

  47. 

  48. fn ConvertNullptrConstant() -> Core.Optional(i32*) {
    49. 

  49.   return Cpp.nullptr;
    50. 

  50. }
    51. 

  51. 

  52. // CHECK:STDOUT: ; ModuleID = 'simple.carbon'
    53. 

  53. // CHECK:STDOUT: source_filename = "simple.carbon"
    54. 

  54. // 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"
    55. 

  55. // CHECK:STDOUT: target triple = "x86_64-unknown-linux-gnu"
    56. 

  56. // CHECK:STDOUT:
    57. 

  57. // CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
    58. 

  58. // CHECK:STDOUT: define dso_local void @_Z11TakeNullptrDn.carbon_thunk(ptr noundef %n) #0 {
    59. 

  59. // CHECK:STDOUT: entry:
    60. 

  60. // CHECK:STDOUT:   %n.addr = alloca ptr, align 8
    61. 

  61. // CHECK:STDOUT:   store ptr %n, ptr %n.addr, align 8, !tbaa !11
    62. 

  62. // CHECK:STDOUT:   %0 = load ptr, ptr %n.addr, align 8, !tbaa !11
    63. 

  63. // CHECK:STDOUT:   call void @_Z11TakeNullptrDn(ptr null)
    64. 

  64. // CHECK:STDOUT:   ret void
    65. 

  65. // CHECK:STDOUT: }
    66. 

  66. // CHECK:STDOUT:
    67. 

  67. // CHECK:STDOUT: declare void @_Z11TakeNullptrDn(ptr) #1
    68. 

  68. // CHECK:STDOUT:
    69. 

  69. // CHECK:STDOUT: ; Function Attrs: alwaysinline mustprogress uwtable
    70. 

  70. // CHECK:STDOUT: define dso_local void @_Z13ReturnNullptrv.carbon_thunk(ptr noundef %return) #0 {
    71. 

  71. // CHECK:STDOUT: entry:
    72. 

  72. // CHECK:STDOUT:   %return.addr = alloca ptr, align 8
    73. 

  73. // CHECK:STDOUT:   store ptr %return, ptr %return.addr, align 8, !tbaa !11
    74. 

  74. // CHECK:STDOUT:   %0 = load ptr, ptr %return.addr, align 8, !tbaa !11
    75. 

  75. // CHECK:STDOUT:   %call = call ptr @_Z13ReturnNullptrv()
    76. 

  76. // CHECK:STDOUT:   store ptr %call, ptr %0, align 8, !tbaa !14
    77. 

  77. // CHECK:STDOUT:   ret void
    78. 

  78. // CHECK:STDOUT: }
    79. 

  79. // CHECK:STDOUT:
    80. 

  80. // CHECK:STDOUT: declare ptr @_Z13ReturnNullptrv() #1
    81. 

  81. // CHECK:STDOUT:
    82. 

  82. // CHECK:STDOUT: ; Function Attrs: nounwind
    83. 

  83. // CHECK:STDOUT: define void @_CPassNullptr.Main() #2 !dbg !16 {
    84. 

  84. // CHECK:STDOUT: entry:
    85. 

  85. // CHECK:STDOUT:   %.loc12_18.2.temp = alloca ptr, align 8, !dbg !19
    86. 

  86. // CHECK:STDOUT:   %.loc14_22.1.temp = alloca ptr, align 8, !dbg !20
    87. 

  87. // CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.83dbfcd16e56a769.Core.b88d1103f417c6d4"(ptr poison), !dbg !19
    88. 

  88. // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc12_18.2.temp), !dbg !19
    89. 

  89. // CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, ptr %.loc12_18.2.temp, align 8, !dbg !19
    90. 

  90. // CHECK:STDOUT:   %.loc12_18.4 = load ptr, ptr %.loc12_18.2.temp, align 8, !dbg !19
    91. 

  91. // CHECK:STDOUT:   call void @_Z7TakePtrPi(ptr %.loc12_18.4), !dbg !21
    92. 

  92. // CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !20
    93. 

  93. // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc14_22.1.temp), !dbg !20
    94. 

  94. // CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, ptr %.loc14_22.1.temp, align 8, !dbg !20
    95. 

  95. // CHECK:STDOUT:   call void @_Z11TakeNullptrDn.carbon_thunk(ptr %.loc14_22.1.temp), !dbg !22
    96. 

  96. // CHECK:STDOUT:   call void @"_COp.705e422c84320121:core.Destroy.Core"(ptr %.loc14_22.1.temp), !dbg !20
    97. 

  97. // CHECK:STDOUT:   call void @"_COp.dc33c1983710215f:core.Destroy.Core"(ptr %.loc12_18.2.temp), !dbg !19
    98. 

  98. // CHECK:STDOUT:   ret void, !dbg !23
    99. 

  99. // CHECK:STDOUT: }
    100. 

  100. // CHECK:STDOUT:
    101. 

  101. // CHECK:STDOUT: declare void @_Z7TakePtrPi(ptr noundef) #1
    102. 

  102. // CHECK:STDOUT:
    103. 

  103. // CHECK:STDOUT: declare ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr)
    104. 

  104. // CHECK:STDOUT:
    105. 

  105. // CHECK:STDOUT: ; Function Attrs: nounwind
    106. 

  106. // CHECK:STDOUT: define weak_odr void @"_COp.705e422c84320121:core.Destroy.Core"(ptr %self) #2 !dbg !24 {
    107. 

  107. // CHECK:STDOUT: entry:
    108. 

  108. // CHECK:STDOUT:   ret void, !dbg !30
    109. 

  109. // CHECK:STDOUT: }
    110. 

  110. // CHECK:STDOUT:
    111. 

  111. // CHECK:STDOUT: ; Function Attrs: nounwind
    112. 

  112. // CHECK:STDOUT: define weak_odr void @"_COp.ca2ce9262234b385:core.Destroy.Core"(ptr %self) #2 !dbg !31 {
    113. 

  113. // CHECK:STDOUT: entry:
    114. 

  114. // CHECK:STDOUT:   ret void, !dbg !34
    115. 

  115. // CHECK:STDOUT: }
    116. 

  116. // CHECK:STDOUT:
    117. 

  117. // CHECK:STDOUT: ; Function Attrs: nounwind
    118. 

  118. // CHECK:STDOUT: define weak_odr void @"_COp.dc33c1983710215f:core.Destroy.Core"(ptr %self) #2 !dbg !35 {
    119. 

  119. // CHECK:STDOUT: entry:
    120. 

  120. // CHECK:STDOUT:   ret void, !dbg !38
    121. 

  121. // CHECK:STDOUT: }
    122. 

  122. // CHECK:STDOUT:
    123. 

  123. // CHECK:STDOUT: ; Function Attrs: nounwind
    124. 

  124. // CHECK:STDOUT: define ptr @_CReturnNullptr.Main() #2 !dbg !39 {
    125. 

  125. // CHECK:STDOUT: entry:
    126. 

  126. // CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !42
    127. 

  127. // CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call, !dbg !43
    128. 

  128. // CHECK:STDOUT: }
    129. 

  129. // CHECK:STDOUT:
    130. 

  130. // CHECK:STDOUT: ; Function Attrs: nounwind
    131. 

  131. // CHECK:STDOUT: define ptr @_CReturnNullptrCopy.Main() #2 !dbg !44 {
    132. 

  132. // CHECK:STDOUT: entry:
    133. 

  133. // CHECK:STDOUT:   %a.var = alloca ptr, align 8, !dbg !45
    134. 

  134. // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !45
    135. 

  135. // CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr poison), !dbg !46
    136. 

  136. // CHECK:STDOUT:   store ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc22, ptr %a.var, align 8, !dbg !45
    137. 

  137. // CHECK:STDOUT:   %.loc23 = load ptr, ptr %a.var, align 8, !dbg !47
    138. 

  138. // CHECK:STDOUT:   %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23 = call ptr @"_COp.NullptrT.CppCompat.Core:Copy.Core"(ptr %.loc23), !dbg !47
    139. 

  139. // CHECK:STDOUT:   call void @"_COp.705e422c84320121:core.Destroy.Core"(ptr %a.var), !dbg !45
    140. 

  140. // CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.Copy.impl.Op.call.loc23, !dbg !48
    141. 

  141. // CHECK:STDOUT: }
    142. 

  142. // CHECK:STDOUT:
    143. 

  143. // CHECK:STDOUT: ; Function Attrs: nounwind
    144. 

  144. // CHECK:STDOUT: define ptr @_CReturnConvertedNullptrIndirectly.Main() #2 !dbg !49 {
    145. 

  145. // CHECK:STDOUT: entry:
    146. 

  146. // CHECK:STDOUT:   %a.var = alloca ptr, align 8, !dbg !50
    147. 

  147. // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %a.var), !dbg !50
    148. 

  148. // CHECK:STDOUT:   call void @_Z13ReturnNullptrv.carbon_thunk(ptr %a.var), !dbg !51
    149. 

  149. // CHECK:STDOUT:   %.loc28_10 = load ptr, ptr %a.var, align 8, !dbg !52
    150. 

  150. // CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.83dbfcd16e56a769.Core.b88d1103f417c6d4"(ptr %.loc28_10), !dbg !53
    151. 

  151. // CHECK:STDOUT:   call void @"_COp.705e422c84320121:core.Destroy.Core"(ptr %a.var), !dbg !50
    152. 

  152. // CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !53
    153. 

  153. // CHECK:STDOUT: }
    154. 

  154. // CHECK:STDOUT:
    155. 

  155. // CHECK:STDOUT: ; Function Attrs: nounwind
    156. 

  156. // CHECK:STDOUT: define ptr @_CReturnConvertedNullptrDirectly.Main() #2 !dbg !54 {
    157. 

  157. // CHECK:STDOUT: entry:
    158. 

  158. // CHECK:STDOUT:   %.loc32_28.1.temp = alloca ptr, align 8, !dbg !55
    159. 

  159. // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(ptr %.loc32_28.1.temp), !dbg !55
    160. 

  160. // CHECK:STDOUT:   call void @_Z13ReturnNullptrv.carbon_thunk(ptr %.loc32_28.1.temp), !dbg !55
    161. 

  161. // CHECK:STDOUT:   %.loc32_28.4 = load ptr, ptr %.loc32_28.1.temp, align 8, !dbg !55
    162. 

  162. // CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.83dbfcd16e56a769.Core.b88d1103f417c6d4"(ptr %.loc32_28.4), !dbg !56
    163. 

  163. // CHECK:STDOUT:   call void @"_COp.705e422c84320121:core.Destroy.Core"(ptr %.loc32_28.1.temp), !dbg !55
    164. 

  164. // CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !56
    165. 

  165. // CHECK:STDOUT: }
    166. 

  166. // CHECK:STDOUT:
    167. 

  167. // CHECK:STDOUT: ; Function Attrs: nounwind
    168. 

  168. // CHECK:STDOUT: define ptr @_CConvertNullptrConstant.Main() #2 !dbg !57 {
    169. 

  169. // CHECK:STDOUT: entry:
    170. 

  170. // CHECK:STDOUT:   %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call = call ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.83dbfcd16e56a769.Core.b88d1103f417c6d4"(ptr poison), !dbg !58
    171. 

  171. // CHECK:STDOUT:   ret ptr %Cpp.nullptr_t.as.ImplicitAs.impl.Convert.call, !dbg !58
    172. 

  172. // CHECK:STDOUT: }
    173. 

  173. // CHECK:STDOUT:
    174. 

  174. // CHECK:STDOUT: ; Function Attrs: nounwind
    175. 

  175. // CHECK:STDOUT: define linkonce_odr ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.83dbfcd16e56a769.Core.b88d1103f417c6d4"(ptr %self) #2 !dbg !59 {
    176. 

  176. // CHECK:STDOUT:   %1 = call ptr @_CNone.Optional.Core.95809cda2a4fffc7(), !dbg !65
    177. 

  177. // CHECK:STDOUT:   ret ptr %1, !dbg !66
    178. 

  178. // CHECK:STDOUT: }
    179. 

  179. // CHECK:STDOUT:
    180. 

  180. // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
    181. 

  181. // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(ptr captures(none)) #3
    182. 

  182. // CHECK:STDOUT:
    183. 

  183. // CHECK:STDOUT: declare ptr @_CMake.NullptrT.CppCompat.Core()
    184. 

  184. // CHECK:STDOUT:
    185. 

  185. // CHECK:STDOUT: ; Function Attrs: nounwind
    186. 

  186. // CHECK:STDOUT: define linkonce_odr ptr @_CNone.Optional.Core.95809cda2a4fffc7() #2 !dbg !67 {
    187. 

  187. // CHECK:STDOUT:   ret ptr null, !dbg !69
    188. 

  188. // CHECK:STDOUT: }
    189. 

  189. // CHECK:STDOUT:
    190. 

  190. // CHECK:STDOUT: ; uselistorder directives
    191. 

  191. // CHECK:STDOUT: uselistorder ptr @"_CConvert.NullptrT.CppCompat.Core:ImplicitAs.83dbfcd16e56a769.Core.b88d1103f417c6d4", { 3, 2, 1, 0 }
    192. 

  192. // CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
    193. 

  193. // CHECK:STDOUT:
    194. 

  194. // CHECK:STDOUT: attributes #0 = { 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" }
    195. 

  195. // 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" }
    196. 

  196. // CHECK:STDOUT: attributes #2 = { nounwind }
    197. 

  197. // CHECK:STDOUT: attributes #3 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
    198. 

  198. // CHECK:STDOUT:
    199. 

  199. // CHECK:STDOUT: !llvm.module.flags = !{!0, !1, !2, !3, !4}
    200. 

  200. // CHECK:STDOUT: !llvm.dbg.cu = !{!5}
    201. 

  201. // CHECK:STDOUT: !llvm.errno.tbaa = !{!7}
    202. 

  202. // CHECK:STDOUT:
    203. 

  203. // CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
    204. 

  204. // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
    205. 

  205. // CHECK:STDOUT: !2 = !{i32 8, !"PIC Level", i32 2}
    206. 

  206. // CHECK:STDOUT: !3 = !{i32 7, !"PIE Level", i32 2}
    207. 

  207. // CHECK:STDOUT: !4 = !{i32 7, !"uwtable", i32 2}
    208. 

  208. // CHECK:STDOUT: !5 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !6, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
    209. 

  209. // CHECK:STDOUT: !6 = !DIFile(filename: "simple.carbon", directory: "")
    210. 

  210. // CHECK:STDOUT: !7 = !{!8, !8, i64 0}
    211. 

  211. // CHECK:STDOUT: !8 = !{!"int", !9, i64 0}
    212. 

  212. // CHECK:STDOUT: !9 = !{!"omnipotent char", !10, i64 0}
    213. 

  213. // CHECK:STDOUT: !10 = !{!"Simple C++ TBAA"}
    214. 

  214. // CHECK:STDOUT: !11 = !{!12, !12, i64 0}
    215. 

  215. // CHECK:STDOUT: !12 = !{!"p1 std::nullptr_t", !13, i64 0}
    216. 

  216. // CHECK:STDOUT: !13 = !{!"any pointer", !9, i64 0}
    217. 

  217. // CHECK:STDOUT: !14 = !{!15, !15, i64 0}
    218. 

  218. // CHECK:STDOUT: !15 = !{!"std::nullptr_t", !9, i64 0}
    219. 

  219. // CHECK:STDOUT: !16 = distinct !DISubprogram(name: "PassNullptr", linkageName: "_CPassNullptr.Main", scope: null, file: !6, line: 11, type: !17, spFlags: DISPFlagDefinition, unit: !5)
    220. 

  220. // CHECK:STDOUT: !17 = !DISubroutineType(types: !18)
    221. 

  221. // CHECK:STDOUT: !18 = !{null}
    222. 

  222. // CHECK:STDOUT: !19 = !DILocation(line: 12, column: 15, scope: !16)
    223. 

  223. // CHECK:STDOUT: !20 = !DILocation(line: 14, column: 19, scope: !16)
    224. 

  224. // CHECK:STDOUT: !21 = !DILocation(line: 12, column: 3, scope: !16)
    225. 

  225. // CHECK:STDOUT: !22 = !DILocation(line: 14, column: 3, scope: !16)
    226. 

  226. // CHECK:STDOUT: !23 = !DILocation(line: 11, column: 1, scope: !16)
    227. 

  227. // CHECK:STDOUT: !24 = distinct !DISubprogram(name: "Op", linkageName: "_COp.705e422c84320121:core.Destroy.Core", scope: null, file: !6, line: 14, type: !25, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !28)
    228. 

  228. // CHECK:STDOUT: !25 = !DISubroutineType(types: !26)
    229. 

  229. // CHECK:STDOUT: !26 = !{null, !27}
    230. 

  230. // CHECK:STDOUT: !27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
    231. 

  231. // CHECK:STDOUT: !28 = !{!29}
    232. 

  232. // CHECK:STDOUT: !29 = !DILocalVariable(arg: 1, scope: !24, type: !27)
    233. 

  233. // CHECK:STDOUT: !30 = !DILocation(line: 14, column: 19, scope: !24)
    234. 

  234. // CHECK:STDOUT: !31 = distinct !DISubprogram(name: "Op", linkageName: "_COp.ca2ce9262234b385:core.Destroy.Core", scope: null, file: !6, line: 12, type: !25, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !32)
    235. 

  235. // CHECK:STDOUT: !32 = !{!33}
    236. 

  236. // CHECK:STDOUT: !33 = !DILocalVariable(arg: 1, scope: !31, type: !27)
    237. 

  237. // CHECK:STDOUT: !34 = !DILocation(line: 12, column: 15, scope: !31)
    238. 

  238. // CHECK:STDOUT: !35 = distinct !DISubprogram(name: "Op", linkageName: "_COp.dc33c1983710215f:core.Destroy.Core", scope: null, file: !6, line: 12, type: !25, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !36)
    239. 

  239. // CHECK:STDOUT: !36 = !{!37}
    240. 

  240. // CHECK:STDOUT: !37 = !DILocalVariable(arg: 1, scope: !35, type: !27)
    241. 

  241. // CHECK:STDOUT: !38 = !DILocation(line: 12, column: 15, scope: !35)
    242. 

  242. // CHECK:STDOUT: !39 = distinct !DISubprogram(name: "ReturnNullptr", linkageName: "_CReturnNullptr.Main", scope: null, file: !6, line: 17, type: !40, spFlags: DISPFlagDefinition, unit: !5)
    243. 

  243. // CHECK:STDOUT: !40 = !DISubroutineType(types: !41)
    244. 

  244. // CHECK:STDOUT: !41 = !{!27}
    245. 

  245. // CHECK:STDOUT: !42 = !DILocation(line: 18, column: 10, scope: !39)
    246. 

  246. // CHECK:STDOUT: !43 = !DILocation(line: 18, column: 3, scope: !39)
    247. 

  247. // CHECK:STDOUT: !44 = distinct !DISubprogram(name: "ReturnNullptrCopy", linkageName: "_CReturnNullptrCopy.Main", scope: null, file: !6, line: 21, type: !40, spFlags: DISPFlagDefinition, unit: !5)
    248. 

  248. // CHECK:STDOUT: !45 = !DILocation(line: 22, column: 3, scope: !44)
    249. 

  249. // CHECK:STDOUT: !46 = !DILocation(line: 22, column: 26, scope: !44)
    250. 

  250. // CHECK:STDOUT: !47 = !DILocation(line: 23, column: 10, scope: !44)
    251. 

  251. // CHECK:STDOUT: !48 = !DILocation(line: 23, column: 3, scope: !44)
    252. 

  252. // CHECK:STDOUT: !49 = distinct !DISubprogram(name: "ReturnConvertedNullptrIndirectly", linkageName: "_CReturnConvertedNullptrIndirectly.Main", scope: null, file: !6, line: 26, type: !40, spFlags: DISPFlagDefinition, unit: !5)
    253. 

  253. // CHECK:STDOUT: !50 = !DILocation(line: 27, column: 3, scope: !49)
    254. 

  254. // CHECK:STDOUT: !51 = !DILocation(line: 27, column: 26, scope: !49)
    255. 

  255. // CHECK:STDOUT: !52 = !DILocation(line: 28, column: 10, scope: !49)
    256. 

  256. // CHECK:STDOUT: !53 = !DILocation(line: 28, column: 3, scope: !49)
    257. 

  257. // CHECK:STDOUT: !54 = distinct !DISubprogram(name: "ReturnConvertedNullptrDirectly", linkageName: "_CReturnConvertedNullptrDirectly.Main", scope: null, file: !6, line: 31, type: !40, spFlags: DISPFlagDefinition, unit: !5)
    258. 

  258. // CHECK:STDOUT: !55 = !DILocation(line: 32, column: 10, scope: !54)
    259. 

  259. // CHECK:STDOUT: !56 = !DILocation(line: 32, column: 3, scope: !54)
    260. 

  260. // CHECK:STDOUT: !57 = distinct !DISubprogram(name: "ConvertNullptrConstant", linkageName: "_CConvertNullptrConstant.Main", scope: null, file: !6, line: 35, type: !40, spFlags: DISPFlagDefinition, unit: !5)
    261. 

  261. // CHECK:STDOUT: !58 = !DILocation(line: 36, column: 3, scope: !57)
    262. 

  262. // CHECK:STDOUT: !59 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.NullptrT.CppCompat.Core:ImplicitAs.83dbfcd16e56a769.Core.b88d1103f417c6d4", scope: null, file: !60, line: 51, type: !61, spFlags: DISPFlagDefinition, unit: !5, retainedNodes: !63)
    263. 

  263. // CHECK:STDOUT: !60 = !DIFile(filename: "{{.*}}/prelude/types/cpp/nullptr.carbon", directory: "")
    264. 

  264. // CHECK:STDOUT: !61 = !DISubroutineType(types: !62)
    265. 

  265. // CHECK:STDOUT: !62 = !{!27, !27}
    266. 

  266. // CHECK:STDOUT: !63 = !{!64}
    267. 

  267. // CHECK:STDOUT: !64 = !DILocalVariable(arg: 1, scope: !59, type: !27)
    268. 

  268. // CHECK:STDOUT: !65 = !DILocation(line: 52, column: 14, scope: !59)
    269. 

  269. // CHECK:STDOUT: !66 = !DILocation(line: 52, column: 7, scope: !59)
    270. 

  270. // CHECK:STDOUT: !67 = distinct !DISubprogram(name: "None", linkageName: "_CNone.Optional.Core.95809cda2a4fffc7", scope: null, file: !68, line: 27, type: !40, spFlags: DISPFlagDefinition, unit: !5)
    271. 

  271. // CHECK:STDOUT: !68 = !DIFile(filename: "{{.*}}/prelude/types/optional.carbon", directory: "")
    272. 

  272. // CHECK:STDOUT: !69 = !DILocation(line: 28, column: 5, scope: !67)
    273.