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carbon-lang/toolchain/lower/testdata/impl/thunk.carbon
T
Richard Smith 7569aff619 Don't convert runtime arguments during deduction. (#7265) 
When performing deduction for a call to a generic function, we would
previously convert runtime arguments to match the parameter type, then
throw away the result. Instead, track whether deduction needs the value
of the argument, which will be the case only within compile-time
contexts such as generic bindings and types of instructions, and only
perform conversions during deduction for those contexts.

Fixes miscompiles when passing an argument requiring a runtime
conversion with side-effects to a generic function, where previously the
side-effects would have happened twice! (Once from deduction and once
from the real call argument conversion.)

Assisted-by: Gemini via Antigravity
2026-05-27 21:44:29 +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/int.carbon
//
// AUTOUPDATE
// TIP: To test this file alone, run:
// TIP: bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/impl/thunk.carbon
// TIP: To dump output, run:
// TIP: bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/impl/thunk.carbon
// --- thunk.carbon
library "[[@TEST_NAME]]";
class A { var a: i32; }
class B { var b: i32; }
class C { var c: i32; }
impl A as Core.ImplicitAs(B) {
fn Convert[self: A]() -> B { return {.b = self.a}; }
}
impl B as Core.ImplicitAs(C) {
fn Convert[self: B]() -> C { return {.c = self.b}; }
}
interface I {
fn F(a: A) -> C;
}
impl () as I {
fn F(b: B) -> B { return {.b = b.b}; }
}
fn Test(a: A) -> C {
return ().(I.F)(a);
}
// --- generic_thunk.carbon
library "[[@TEST_NAME]]";
class A {}
class B {
impl as Core.ImplicitAs(A) {
fn Convert[unused self: Self]() -> A { return {}; }
}
}
interface I(T:! type) {
fn F[self: Self](x: B) -> A;
}
class C(U:! type) {}
impl forall [V:! type] C(V) as I(V) {
fn F[unused self: Self](_: A) -> B { return {}; }
}
fn Call(c: C(()), b: B) -> A {
return c.(I(()).F)(b);
}
fn CallGeneric[T:! I(())](c: T, b: B) -> A {
return c.F(b);
}
fn CallCallGeneric(c: C(()), b: B) -> A {
return CallGeneric(c, b);
}
// CHECK:STDOUT: ; ModuleID = 'thunk.carbon'
// CHECK:STDOUT: source_filename = "thunk.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CConvert.A.Main:ImplicitAs.8b79c6c1932e58f6.Core"(ptr sret({ i32 }) %return, ptr %self) #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc9_49.1.a = getelementptr inbounds nuw { i32 }, ptr %self, i32 0, i32 0, !dbg !10
// CHECK:STDOUT: %.loc9_49.2 = load i32, ptr %.loc9_49.1.a, align 4, !dbg !10
// CHECK:STDOUT: %.loc9_51.2.b = getelementptr inbounds nuw { i32 }, ptr %return, i32 0, i32 0, !dbg !11
// CHECK:STDOUT: store i32 %.loc9_49.2, ptr %.loc9_51.2.b, align 4, !dbg !11
// CHECK:STDOUT: ret void, !dbg !12
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CConvert.B.Main:ImplicitAs.cc918b9f1e9f377a.Core"(ptr sret({ i32 }) %return, ptr %self) #0 !dbg !13 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc12_49.1.b = getelementptr inbounds nuw { i32 }, ptr %self, i32 0, i32 0, !dbg !16
// CHECK:STDOUT: %.loc12_49.2 = load i32, ptr %.loc12_49.1.b, align 4, !dbg !16
// CHECK:STDOUT: %.loc12_51.2.c = getelementptr inbounds nuw { i32 }, ptr %return, i32 0, i32 0, !dbg !17
// CHECK:STDOUT: store i32 %.loc12_49.2, ptr %.loc12_51.2.c, align 4, !dbg !17
// CHECK:STDOUT: ret void, !dbg !18
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CF.61ea2aba74ab3bf1:I.Main"(ptr sret({ i32 }) %return, ptr %b) #0 !dbg !19 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc20_35.1.b = getelementptr inbounds nuw { i32 }, ptr %b, i32 0, i32 0, !dbg !22
// CHECK:STDOUT: %.loc20_35.2 = load i32, ptr %.loc20_35.1.b, align 4, !dbg !22
// CHECK:STDOUT: %.loc20_37.2.b = getelementptr inbounds nuw { i32 }, ptr %return, i32 0, i32 0, !dbg !23
// CHECK:STDOUT: store i32 %.loc20_35.2, ptr %.loc20_37.2.b, align 4, !dbg !23
// CHECK:STDOUT: ret void, !dbg !24
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define void @"_CF:thunk:I.01f5c37cad34e90b.Main:61ea2aba74ab3bf1:I.Main"(ptr sret({ i32 }) %return, ptr %a) #1 !dbg !25 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc20_19.1.temp = alloca { i32 }, align 8, !dbg !28
// CHECK:STDOUT: %.loc16_9.1.temp = alloca { i32 }, align 8, !dbg !29
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc20_19.1.temp), !dbg !28
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc16_9.1.temp), !dbg !29
// CHECK:STDOUT: call void @"_CConvert.A.Main:ImplicitAs.8b79c6c1932e58f6.Core"(ptr %.loc16_9.1.temp, ptr %a), !dbg !29
// CHECK:STDOUT: call void @"_CF.61ea2aba74ab3bf1:I.Main"(ptr %.loc20_19.1.temp, ptr %.loc16_9.1.temp), !dbg !28
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.cc918b9f1e9f377a.Core"(ptr %return, ptr %.loc20_19.1.temp), !dbg !28
// CHECK:STDOUT: call void @"_COp.c989b489e17b3e13:core.Destroy.Core"(ptr %.loc20_19.1.temp), !dbg !28
// CHECK:STDOUT: call void @"_COp.c989b489e17b3e13:core.Destroy.Core"(ptr %.loc16_9.1.temp), !dbg !29
// CHECK:STDOUT: ret void, !dbg !28
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.94e3ca86614aba5d:core.Destroy.Core"(ptr %self) #0 !dbg !30 {
// 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.a9ac47a486d88918:core.Destroy.Core"(ptr %self) #0 !dbg !37 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !42
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.c989b489e17b3e13:core.Destroy.Core"(ptr %self) #0 !dbg !43 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !46
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CTest.Main(ptr sret({ i32 }) %return, ptr %a) #0 !dbg !47 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc24_20.1.temp = alloca { i32 }, align 8, !dbg !50
// CHECK:STDOUT: %.loc24_20.2.temp = alloca { i32 }, align 8, !dbg !50
// CHECK:STDOUT: %.loc24_19.1.temp = alloca { i32 }, align 8, !dbg !51
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc24_20.1.temp), !dbg !50
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc24_20.2.temp), !dbg !50
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc24_19.1.temp), !dbg !51
// CHECK:STDOUT: call void @"_CConvert.A.Main:ImplicitAs.8b79c6c1932e58f6.Core"(ptr %.loc24_19.1.temp, ptr %a), !dbg !51
// CHECK:STDOUT: call void @"_CF.61ea2aba74ab3bf1:I.Main"(ptr %.loc24_20.2.temp, ptr %.loc24_19.1.temp), !dbg !50
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.cc918b9f1e9f377a.Core"(ptr %return, ptr %.loc24_20.2.temp), !dbg !52
// CHECK:STDOUT: call void @"_COp.c989b489e17b3e13:core.Destroy.Core"(ptr %.loc24_20.2.temp), !dbg !50
// CHECK:STDOUT: call void @"_COp.c989b489e17b3e13:core.Destroy.Core"(ptr %.loc24_19.1.temp), !dbg !51
// CHECK:STDOUT: ret void, !dbg !52
// 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)) #2
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @"_COp.c989b489e17b3e13:core.Destroy.Core", { 0, 1, 3, 2 }
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 4, 3, 2, 1, 0 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { alwaysinline nounwind }
// CHECK:STDOUT: attributes #2 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "thunk.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.A.Main:ImplicitAs.8b79c6c1932e58f6.Core", scope: null, file: !3, line: 9, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{!7, !7}
// CHECK:STDOUT: !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !8 = !{!9}
// CHECK:STDOUT: !9 = !DILocalVariable(arg: 1, scope: !4, type: !7)
// CHECK:STDOUT: !10 = !DILocation(line: 9, column: 45, scope: !4)
// CHECK:STDOUT: !11 = !DILocation(line: 9, column: 39, scope: !4)
// CHECK:STDOUT: !12 = !DILocation(line: 9, column: 32, scope: !4)
// CHECK:STDOUT: !13 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.B.Main:ImplicitAs.cc918b9f1e9f377a.Core", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !14)
// CHECK:STDOUT: !14 = !{!15}
// CHECK:STDOUT: !15 = !DILocalVariable(arg: 1, scope: !13, type: !7)
// CHECK:STDOUT: !16 = !DILocation(line: 12, column: 45, scope: !13)
// CHECK:STDOUT: !17 = !DILocation(line: 12, column: 39, scope: !13)
// CHECK:STDOUT: !18 = !DILocation(line: 12, column: 32, scope: !13)
// CHECK:STDOUT: !19 = distinct !DISubprogram(name: "F", linkageName: "_CF.61ea2aba74ab3bf1:I.Main", scope: null, file: !3, line: 20, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !20)
// CHECK:STDOUT: !20 = !{!21}
// CHECK:STDOUT: !21 = !DILocalVariable(arg: 1, scope: !19, type: !7)
// CHECK:STDOUT: !22 = !DILocation(line: 20, column: 34, scope: !19)
// CHECK:STDOUT: !23 = !DILocation(line: 20, column: 28, scope: !19)
// CHECK:STDOUT: !24 = !DILocation(line: 20, column: 21, scope: !19)
// CHECK:STDOUT: !25 = distinct !DISubprogram(name: "F", linkageName: "_CF:thunk:I.01f5c37cad34e90b.Main:61ea2aba74ab3bf1:I.Main", scope: null, file: !3, line: 20, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !26)
// CHECK:STDOUT: !26 = !{!27}
// CHECK:STDOUT: !27 = !DILocalVariable(arg: 1, scope: !25, type: !7)
// CHECK:STDOUT: !28 = !DILocation(line: 20, column: 3, scope: !25)
// CHECK:STDOUT: !29 = !DILocation(line: 16, column: 8, scope: !25)
// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "Op", linkageName: "_COp.94e3ca86614aba5d:core.Destroy.Core", scope: null, file: !3, line: 20, type: !31, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !34)
// CHECK:STDOUT: !31 = !DISubroutineType(types: !32)
// CHECK:STDOUT: !32 = !{null, !33}
// CHECK:STDOUT: !33 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
// CHECK:STDOUT: !34 = !{!35}
// CHECK:STDOUT: !35 = !DILocalVariable(arg: 1, scope: !30, type: !33)
// CHECK:STDOUT: !36 = !DILocation(line: 20, column: 3, scope: !30)
// CHECK:STDOUT: !37 = distinct !DISubprogram(name: "Op", linkageName: "_COp.a9ac47a486d88918:core.Destroy.Core", scope: null, file: !3, line: 20, type: !38, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !40)
// CHECK:STDOUT: !38 = !DISubroutineType(types: !39)
// CHECK:STDOUT: !39 = !{null, !7}
// CHECK:STDOUT: !40 = !{!41}
// CHECK:STDOUT: !41 = !DILocalVariable(arg: 1, scope: !37, type: !7)
// CHECK:STDOUT: !42 = !DILocation(line: 20, column: 3, scope: !37)
// CHECK:STDOUT: !43 = distinct !DISubprogram(name: "Op", linkageName: "_COp.c989b489e17b3e13:core.Destroy.Core", scope: null, file: !3, line: 20, type: !38, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !44)
// CHECK:STDOUT: !44 = !{!45}
// CHECK:STDOUT: !45 = !DILocalVariable(arg: 1, scope: !43, type: !7)
// CHECK:STDOUT: !46 = !DILocation(line: 20, column: 3, scope: !43)
// CHECK:STDOUT: !47 = distinct !DISubprogram(name: "Test", linkageName: "_CTest.Main", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !48)
// CHECK:STDOUT: !48 = !{!49}
// CHECK:STDOUT: !49 = !DILocalVariable(arg: 1, scope: !47, type: !7)
// CHECK:STDOUT: !50 = !DILocation(line: 24, column: 10, scope: !47)
// CHECK:STDOUT: !51 = !DILocation(line: 24, column: 19, scope: !47)
// CHECK:STDOUT: !52 = !DILocation(line: 24, column: 3, scope: !47)
// CHECK:STDOUT: ; ModuleID = 'generic_thunk.carbon'
// CHECK:STDOUT: source_filename = "generic_thunk.carbon"
// CHECK:STDOUT:
// CHECK:STDOUT: @A.val.loc7_53 = internal constant {} zeroinitializer
// CHECK:STDOUT: @B.val.loc18_49 = internal constant {} zeroinitializer
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @"_CConvert.B.Main:ImplicitAs.46f7e99dd8f31ccb.Core"(ptr sret({}) %return, ptr %self) #0 !dbg !4 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %return, ptr align 1 @A.val.loc7_53, i64 0, i1 false), !dbg !10
// CHECK:STDOUT: ret void, !dbg !10
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.7ce54547ef4d499a:core.Destroy.Core"(ptr %self) #0 !dbg !11 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !16
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define weak_odr void @"_COp.c14becfc5db4251e:core.Destroy.Core"(ptr %self) #0 !dbg !17 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: ret void, !dbg !20
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CCall.Main(ptr sret({}) %return, ptr %c, ptr %b) #0 !dbg !21 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc22_23.1.temp = alloca {}, align 8, !dbg !27
// CHECK:STDOUT: %.loc22_23.3.temp = alloca {}, align 8, !dbg !27
// CHECK:STDOUT: %.loc22_22.1.temp = alloca {}, align 8, !dbg !28
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc22_23.1.temp), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc22_23.3.temp), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc22_22.1.temp), !dbg !28
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.46f7e99dd8f31ccb.Core"(ptr %.loc22_22.1.temp, ptr %b), !dbg !28
// CHECK:STDOUT: call void @"_CF.C.eb057aa32837c84e.Main:I.eb057aa32837c84e.Main.e43630e9a6c38c3f"(ptr %.loc22_23.3.temp, ptr %c, ptr %.loc22_22.1.temp), !dbg !27
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.46f7e99dd8f31ccb.Core"(ptr %return, ptr %.loc22_23.3.temp), !dbg !29
// CHECK:STDOUT: call void @"_COp.7ce54547ef4d499a:core.Destroy.Core"(ptr %.loc22_23.3.temp), !dbg !27
// CHECK:STDOUT: call void @"_COp.c14becfc5db4251e:core.Destroy.Core"(ptr %.loc22_22.1.temp), !dbg !28
// CHECK:STDOUT: ret void, !dbg !29
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define void @_CCallCallGeneric.Main(ptr sret({}) %return, ptr %c, ptr %b) #0 !dbg !30 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @_CCallGeneric.Main.18bae34346379f4e(ptr %return, ptr %c, ptr %b), !dbg !34
// CHECK:STDOUT: ret void, !dbg !35
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
// CHECK:STDOUT: declare void @llvm.memcpy.p0.p0.i64(ptr noalias writeonly captures(none), ptr noalias readonly captures(none), i64, i1 immarg) #1
// 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 void @"_CF.C.eb057aa32837c84e.Main:I.eb057aa32837c84e.Main.e43630e9a6c38c3f"(ptr sret({}) %return, ptr %self, ptr %_) #0 !dbg !36 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @llvm.memcpy.p0.p0.i64(ptr align 1 %return, ptr align 1 @B.val.loc18_49, i64 0, i1 false), !dbg !40
// CHECK:STDOUT: ret void, !dbg !40
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: nounwind
// CHECK:STDOUT: define linkonce_odr void @_CCallGeneric.Main.18bae34346379f4e(ptr sret({}) %return, ptr %c, ptr %b) #0 !dbg !41 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: call void @"_CF:thunk:I.a61d280f5ea4bfd8.Main:C.eb057aa32837c84e.Main:I.eb057aa32837c84e.Main.e43630e9a6c38c3f"(ptr %return, ptr %c, ptr %b), !dbg !45
// CHECK:STDOUT: ret void, !dbg !46
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; Function Attrs: alwaysinline nounwind
// CHECK:STDOUT: define linkonce_odr void @"_CF:thunk:I.a61d280f5ea4bfd8.Main:C.eb057aa32837c84e.Main:I.eb057aa32837c84e.Main.e43630e9a6c38c3f"(ptr sret({}) %return, ptr %self, ptr %x) #2 !dbg !47 {
// CHECK:STDOUT: entry:
// CHECK:STDOUT: %.loc18_38.2.temp = alloca {}, align 8, !dbg !51
// CHECK:STDOUT: %.loc12_21.1.temp = alloca {}, align 8, !dbg !52
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc18_38.2.temp), !dbg !51
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc12_21.1.temp), !dbg !52
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.46f7e99dd8f31ccb.Core"(ptr %.loc12_21.1.temp, ptr %x), !dbg !52
// CHECK:STDOUT: call void @"_CF.C.eb057aa32837c84e.Main:I.eb057aa32837c84e.Main.e43630e9a6c38c3f"(ptr %.loc18_38.2.temp, ptr %self, ptr %.loc12_21.1.temp), !dbg !51
// CHECK:STDOUT: call void @"_CConvert.B.Main:ImplicitAs.46f7e99dd8f31ccb.Core"(ptr %return, ptr %.loc18_38.2.temp), !dbg !51
// CHECK:STDOUT: call void @"_COp.7ce54547ef4d499a:core.Destroy.Core"(ptr %.loc18_38.2.temp), !dbg !51
// CHECK:STDOUT: call void @"_COp.c14becfc5db4251e:core.Destroy.Core"(ptr %.loc12_21.1.temp), !dbg !52
// CHECK:STDOUT: ret void, !dbg !51
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: ; uselistorder directives
// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 1, 4, 3, 2 }
// CHECK:STDOUT:
// CHECK:STDOUT: attributes #0 = { nounwind }
// CHECK:STDOUT: attributes #1 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
// CHECK:STDOUT: attributes #2 = { alwaysinline nounwind }
// CHECK:STDOUT:
// CHECK:STDOUT: !llvm.module.flags = !{!0, !1}
// CHECK:STDOUT: !llvm.dbg.cu = !{!2}
// CHECK:STDOUT:
// CHECK:STDOUT: !0 = !{i32 7, !"Dwarf Version", i32 5}
// CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
// CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
// CHECK:STDOUT: !3 = !DIFile(filename: "generic_thunk.carbon", directory: "")
// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "Convert", linkageName: "_CConvert.B.Main:ImplicitAs.46f7e99dd8f31ccb.Core", scope: null, file: !3, line: 7, type: !5, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !8)
// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
// CHECK:STDOUT: !6 = !{!7, !7}
// CHECK:STDOUT: !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
// CHECK:STDOUT: !8 = !{!9}
// CHECK:STDOUT: !9 = !DILocalVariable(arg: 1, scope: !4, type: !7)
// CHECK:STDOUT: !10 = !DILocation(line: 7, column: 44, scope: !4)
// CHECK:STDOUT: !11 = distinct !DISubprogram(name: "Op", linkageName: "_COp.7ce54547ef4d499a:core.Destroy.Core", scope: null, file: !3, line: 18, type: !12, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !14)
// CHECK:STDOUT: !12 = !DISubroutineType(types: !13)
// CHECK:STDOUT: !13 = !{null, !7}
// CHECK:STDOUT: !14 = !{!15}
// CHECK:STDOUT: !15 = !DILocalVariable(arg: 1, scope: !11, type: !7)
// CHECK:STDOUT: !16 = !DILocation(line: 18, column: 3, scope: !11)
// CHECK:STDOUT: !17 = distinct !DISubprogram(name: "Op", linkageName: "_COp.c14becfc5db4251e:core.Destroy.Core", scope: null, file: !3, line: 12, type: !12, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !18)
// CHECK:STDOUT: !18 = !{!19}
// CHECK:STDOUT: !19 = !DILocalVariable(arg: 1, scope: !17, type: !7)
// CHECK:STDOUT: !20 = !DILocation(line: 12, column: 20, scope: !17)
// CHECK:STDOUT: !21 = distinct !DISubprogram(name: "Call", linkageName: "_CCall.Main", scope: null, file: !3, line: 21, type: !22, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !24)
// CHECK:STDOUT: !22 = !DISubroutineType(types: !23)
// CHECK:STDOUT: !23 = !{!7, !7, !7}
// CHECK:STDOUT: !24 = !{!25, !26}
// CHECK:STDOUT: !25 = !DILocalVariable(arg: 1, scope: !21, type: !7)
// CHECK:STDOUT: !26 = !DILocalVariable(arg: 2, scope: !21, type: !7)
// CHECK:STDOUT: !27 = !DILocation(line: 22, column: 10, scope: !21)
// CHECK:STDOUT: !28 = !DILocation(line: 22, column: 22, scope: !21)
// CHECK:STDOUT: !29 = !DILocation(line: 22, column: 3, scope: !21)
// CHECK:STDOUT: !30 = distinct !DISubprogram(name: "CallCallGeneric", linkageName: "_CCallCallGeneric.Main", scope: null, file: !3, line: 29, type: !22, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !31)
// CHECK:STDOUT: !31 = !{!32, !33}
// CHECK:STDOUT: !32 = !DILocalVariable(arg: 1, scope: !30, type: !7)
// CHECK:STDOUT: !33 = !DILocalVariable(arg: 2, scope: !30, type: !7)
// CHECK:STDOUT: !34 = !DILocation(line: 30, column: 10, scope: !30)
// CHECK:STDOUT: !35 = !DILocation(line: 30, column: 3, scope: !30)
// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "F", linkageName: "_CF.C.eb057aa32837c84e.Main:I.eb057aa32837c84e.Main.e43630e9a6c38c3f", scope: null, file: !3, line: 18, type: !22, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !37)
// CHECK:STDOUT: !37 = !{!38, !39}
// CHECK:STDOUT: !38 = !DILocalVariable(arg: 1, scope: !36, type: !7)
// CHECK:STDOUT: !39 = !DILocalVariable(arg: 2, scope: !36, type: !7)
// CHECK:STDOUT: !40 = !DILocation(line: 18, column: 40, scope: !36)
// CHECK:STDOUT: !41 = distinct !DISubprogram(name: "CallGeneric", linkageName: "_CCallGeneric.Main.18bae34346379f4e", scope: null, file: !3, line: 25, type: !22, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !42)
// CHECK:STDOUT: !42 = !{!43, !44}
// CHECK:STDOUT: !43 = !DILocalVariable(arg: 1, scope: !41, type: !7)
// CHECK:STDOUT: !44 = !DILocalVariable(arg: 2, scope: !41, type: !7)
// CHECK:STDOUT: !45 = !DILocation(line: 26, column: 10, scope: !41)
// CHECK:STDOUT: !46 = !DILocation(line: 26, column: 3, scope: !41)
// CHECK:STDOUT: !47 = distinct !DISubprogram(name: "F", linkageName: "_CF:thunk:I.a61d280f5ea4bfd8.Main:C.eb057aa32837c84e.Main:I.eb057aa32837c84e.Main.e43630e9a6c38c3f", scope: null, file: !3, line: 18, type: !22, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !48)
// CHECK:STDOUT: !48 = !{!49, !50}
// CHECK:STDOUT: !49 = !DILocalVariable(arg: 1, scope: !47, type: !7)
// CHECK:STDOUT: !50 = !DILocalVariable(arg: 2, scope: !47, type: !7)
// CHECK:STDOUT: !51 = !DILocation(line: 18, column: 3, scope: !47)
// CHECK:STDOUT: !52 = !DILocation(line: 12, column: 20, scope: !47)
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