diff --git a/toolchain/lower/testdata/function/generic/call_basic.carbon b/toolchain/lower/testdata/function/generic/call_basic.carbon
index a836ffe8d446..d26a8f4c3291 100644
--- a/toolchain/lower/testdata/function/generic/call_basic.carbon
+++ b/toolchain/lower/testdata/function/generic/call_basic.carbon
@@ -34,6 +34,9 @@ fn G[T:! type](x: T) -> T {
 
   var c: C;
   c.Cfn(x);
+  // Currently, the definition of this H lowers to a void method with a param
+  // as the return slot and taking a ptr param.
+  H(c);
 
   return x;
 }
@@ -48,6 +51,15 @@ fn M() {
   m = G(n);
   F(p);
   q = G(p);
+
+  // TODO: Currently, the definitions of H for these calls lower to different
+  // identical functions taking a ptr param and returning a ptr.
+  var ptr_i32 : i32*;
+  H(ptr_i32);
+  var ptr_f64 : f64*;
+  H(ptr_f64);
+  var ptr_i8 : i8*;
+  H(ptr_i8);
 }
 
 // CHECK:STDOUT: ; ModuleID = 'call_basic.carbon'
@@ -61,135 +73,174 @@ fn M() {
 // CHECK:STDOUT:   %m.var = alloca i32, align 4, !dbg !7
 // CHECK:STDOUT:   %p.var = alloca double, align 8, !dbg !7
 // CHECK:STDOUT:   %q.var = alloca double, align 8, !dbg !7
+// CHECK:STDOUT:   %ptr_i32.var = alloca ptr, align 8, !dbg !7
+// CHECK:STDOUT:   %ptr_f64.var = alloca ptr, align 8, !dbg !7
+// CHECK:STDOUT:   %ptr_i8.var = alloca ptr, align 8, !dbg !7
 // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 4, ptr %n.var), !dbg !7
 // CHECK:STDOUT:   store i32 0, ptr %n.var, align 4, !dbg !7
 // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 4, ptr %m.var), !dbg !7
 // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %p.var), !dbg !7
 // CHECK:STDOUT:   store double 1.000000e+00, ptr %p.var, align 8, !dbg !8
 // CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %q.var), !dbg !7
-// CHECK:STDOUT:   %.loc47 = load i32, ptr %n.var, align 4, !dbg !9
-// CHECK:STDOUT:   call void @_CF.Main.b88d1103f417c6d4(i32 %.loc47), !dbg !10
-// CHECK:STDOUT:   %.loc48 = load i32, ptr %n.var, align 4, !dbg !11
-// CHECK:STDOUT:   %G.call.loc48 = call i32 @_CG.Main.b88d1103f417c6d4(i32 %.loc48), !dbg !12
-// CHECK:STDOUT:   store i32 %G.call.loc48, ptr %m.var, align 4, !dbg !13
-// CHECK:STDOUT:   %.loc49 = load double, ptr %p.var, align 8, !dbg !14
-// CHECK:STDOUT:   call void @_CF.Main.66be507887ceee78(double %.loc49), !dbg !15
-// CHECK:STDOUT:   %.loc50 = load double, ptr %p.var, align 8, !dbg !16
-// CHECK:STDOUT:   %G.call.loc50 = call double @_CG.Main.66be507887ceee78(double %.loc50), !dbg !17
-// CHECK:STDOUT:   store double %G.call.loc50, ptr %q.var, align 8, !dbg !18
-// CHECK:STDOUT:   ret void, !dbg !19
+// CHECK:STDOUT:   %.loc50 = load i32, ptr %n.var, align 4, !dbg !9
+// CHECK:STDOUT:   call void @_CF.Main.b88d1103f417c6d4(i32 %.loc50), !dbg !10
+// CHECK:STDOUT:   %.loc51 = load i32, ptr %n.var, align 4, !dbg !11
+// CHECK:STDOUT:   %G.call.loc51 = call i32 @_CG.Main.b88d1103f417c6d4(i32 %.loc51), !dbg !12
+// CHECK:STDOUT:   store i32 %G.call.loc51, ptr %m.var, align 4, !dbg !13
+// CHECK:STDOUT:   %.loc52 = load double, ptr %p.var, align 8, !dbg !14
+// CHECK:STDOUT:   call void @_CF.Main.66be507887ceee78(double %.loc52), !dbg !15
+// CHECK:STDOUT:   %.loc53 = load double, ptr %p.var, align 8, !dbg !16
+// CHECK:STDOUT:   %G.call.loc53 = call double @_CG.Main.66be507887ceee78(double %.loc53), !dbg !17
+// CHECK:STDOUT:   store double %G.call.loc53, ptr %q.var, align 8, !dbg !18
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %ptr_i32.var), !dbg !7
+// CHECK:STDOUT:   %.loc58 = load ptr, ptr %ptr_i32.var, align 8, !dbg !19
+// CHECK:STDOUT:   %H.call.loc58 = call ptr @_CH.Main.e8193710fd35b608(ptr %.loc58), !dbg !20
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %ptr_f64.var), !dbg !7
+// CHECK:STDOUT:   %.loc60 = load ptr, ptr %ptr_f64.var, align 8, !dbg !21
+// CHECK:STDOUT:   %H.call.loc60 = call ptr @_CH.Main.04bf2edaaa84aa22(ptr %.loc60), !dbg !22
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %ptr_i8.var), !dbg !7
+// CHECK:STDOUT:   %.loc62 = load ptr, ptr %ptr_i8.var, align 8, !dbg !23
+// CHECK:STDOUT:   %H.call.loc62 = call ptr @_CH.Main.bda010de15e6a5ad(ptr %.loc62), !dbg !24
+// CHECK:STDOUT:   ret void, !dbg !25
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
 // CHECK:STDOUT: declare void @llvm.lifetime.start.p0(i64 immarg, ptr captures(none)) #0
 // CHECK:STDOUT:
-// CHECK:STDOUT: define void @_CF.Main.b88d1103f417c6d4(i32 %x) !dbg !20 {
+// CHECK:STDOUT: define void @_CF.Main.b88d1103f417c6d4(i32 %x) !dbg !26 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !21
+// CHECK:STDOUT:   ret void, !dbg !27
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define i32 @_CG.Main.b88d1103f417c6d4(i32 %x) !dbg !22 {
+// CHECK:STDOUT: define i32 @_CG.Main.b88d1103f417c6d4(i32 %x) !dbg !28 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %a.var = alloca double, align 8, !dbg !23
-// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !24
-// CHECK:STDOUT:   %H.call.loc25 = call i32 @_CH.Main.b88d1103f417c6d4(i32 %x), !dbg !24
-// CHECK:STDOUT:   %H.call.loc26 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !25
-// CHECK:STDOUT:   %H.call.loc27 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !26
-// CHECK:STDOUT:   %G.call.loc28 = call i32 @_CG.Main.b88d1103f417c6d4(i32 %x), !dbg !27
-// CHECK:STDOUT:   %H.call.loc28 = call i32 @_CH.Main.b88d1103f417c6d4(i32 %G.call.loc28), !dbg !28
-// CHECK:STDOUT:   %G.call.loc29 = call %type @_CG.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !29
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %a.var), !dbg !23
-// CHECK:STDOUT:   %.loc32 = load double, ptr %a.var, align 8, !dbg !30
-// CHECK:STDOUT:   %G.call.loc32 = call double @_CG.Main.66be507887ceee78(double %.loc32), !dbg !31
-// CHECK:STDOUT:   %.loc33 = load double, ptr %a.var, align 8, !dbg !32
-// CHECK:STDOUT:   %H.call.loc33 = call double @_CH.Main.66be507887ceee78(double %.loc33), !dbg !33
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 0, ptr %c.var), !dbg !24
-// CHECK:STDOUT:   call void @_CCfn.C.Main.b88d1103f417c6d4(ptr %c.var, i32 %x), !dbg !34
-// CHECK:STDOUT:   ret i32 %x, !dbg !35
+// CHECK:STDOUT:   %a.var = alloca double, align 8, !dbg !29
+// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !30
+// CHECK:STDOUT:   %H.call.loc25 = call i32 @_CH.Main.b88d1103f417c6d4(i32 %x), !dbg !30
+// CHECK:STDOUT:   %H.call.loc26 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !31
+// CHECK:STDOUT:   %H.call.loc27 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !32
+// CHECK:STDOUT:   %G.call.loc28 = call i32 @_CG.Main.b88d1103f417c6d4(i32 %x), !dbg !33
+// CHECK:STDOUT:   %H.call.loc28 = call i32 @_CH.Main.b88d1103f417c6d4(i32 %G.call.loc28), !dbg !34
+// CHECK:STDOUT:   %G.call.loc29 = call %type @_CG.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !35
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %a.var), !dbg !29
+// CHECK:STDOUT:   %.loc32 = load double, ptr %a.var, align 8, !dbg !36
+// CHECK:STDOUT:   %G.call.loc32 = call double @_CG.Main.66be507887ceee78(double %.loc32), !dbg !37
+// CHECK:STDOUT:   %.loc33 = load double, ptr %a.var, align 8, !dbg !38
+// CHECK:STDOUT:   %H.call.loc33 = call double @_CH.Main.66be507887ceee78(double %.loc33), !dbg !39
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 0, ptr %c.var), !dbg !30
+// CHECK:STDOUT:   call void @_CCfn.C.Main.b88d1103f417c6d4(ptr %c.var, i32 %x), !dbg !40
+// CHECK:STDOUT:   %.loc39_6.1.temp = alloca {}, align 8, !dbg !41
+// CHECK:STDOUT:   call void @_CH.Main.15b1f98bd9cc0c5b(ptr %.loc39_6.1.temp, ptr %c.var), !dbg !41
+// CHECK:STDOUT:   ret i32 %x, !dbg !42
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define void @_CF.Main.66be507887ceee78(double %x) !dbg !36 {
+// CHECK:STDOUT: define void @_CF.Main.66be507887ceee78(double %x) !dbg !43 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !37
+// CHECK:STDOUT:   ret void, !dbg !44
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define double @_CG.Main.66be507887ceee78(double %x) !dbg !38 {
+// CHECK:STDOUT: define double @_CG.Main.66be507887ceee78(double %x) !dbg !45 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %a.var = alloca double, align 8, !dbg !39
-// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !40
-// CHECK:STDOUT:   %H.call.loc25 = call double @_CH.Main.66be507887ceee78(double %x), !dbg !40
-// CHECK:STDOUT:   %H.call.loc26 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !41
-// CHECK:STDOUT:   %H.call.loc27 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !42
-// CHECK:STDOUT:   %G.call.loc28 = call double @_CG.Main.66be507887ceee78(double %x), !dbg !43
-// CHECK:STDOUT:   %H.call.loc28 = call double @_CH.Main.66be507887ceee78(double %G.call.loc28), !dbg !44
-// CHECK:STDOUT:   %G.call.loc29 = call %type @_CG.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !45
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %a.var), !dbg !39
-// CHECK:STDOUT:   %.loc32 = load double, ptr %a.var, align 8, !dbg !46
-// CHECK:STDOUT:   %G.call.loc32 = call double @_CG.Main.66be507887ceee78(double %.loc32), !dbg !47
-// CHECK:STDOUT:   %.loc33 = load double, ptr %a.var, align 8, !dbg !48
-// CHECK:STDOUT:   %H.call.loc33 = call double @_CH.Main.66be507887ceee78(double %.loc33), !dbg !49
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 0, ptr %c.var), !dbg !40
-// CHECK:STDOUT:   call void @_CCfn.C.Main.66be507887ceee78(ptr %c.var, double %x), !dbg !50
-// CHECK:STDOUT:   ret double %x, !dbg !51
+// CHECK:STDOUT:   %a.var = alloca double, align 8, !dbg !46
+// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !47
+// CHECK:STDOUT:   %H.call.loc25 = call double @_CH.Main.66be507887ceee78(double %x), !dbg !47
+// CHECK:STDOUT:   %H.call.loc26 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !48
+// CHECK:STDOUT:   %H.call.loc27 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !49
+// CHECK:STDOUT:   %G.call.loc28 = call double @_CG.Main.66be507887ceee78(double %x), !dbg !50
+// CHECK:STDOUT:   %H.call.loc28 = call double @_CH.Main.66be507887ceee78(double %G.call.loc28), !dbg !51
+// CHECK:STDOUT:   %G.call.loc29 = call %type @_CG.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !52
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %a.var), !dbg !46
+// CHECK:STDOUT:   %.loc32 = load double, ptr %a.var, align 8, !dbg !53
+// CHECK:STDOUT:   %G.call.loc32 = call double @_CG.Main.66be507887ceee78(double %.loc32), !dbg !54
+// CHECK:STDOUT:   %.loc33 = load double, ptr %a.var, align 8, !dbg !55
+// CHECK:STDOUT:   %H.call.loc33 = call double @_CH.Main.66be507887ceee78(double %.loc33), !dbg !56
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 0, ptr %c.var), !dbg !47
+// CHECK:STDOUT:   call void @_CCfn.C.Main.66be507887ceee78(ptr %c.var, double %x), !dbg !57
+// CHECK:STDOUT:   %.loc39_6.1.temp = alloca {}, align 8, !dbg !58
+// CHECK:STDOUT:   call void @_CH.Main.15b1f98bd9cc0c5b(ptr %.loc39_6.1.temp, ptr %c.var), !dbg !58
+// CHECK:STDOUT:   ret double %x, !dbg !59
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define i32 @_CH.Main.b88d1103f417c6d4(i32 %x) !dbg !52 {
+// CHECK:STDOUT: define ptr @_CH.Main.e8193710fd35b608(ptr %x) !dbg !60 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret i32 %x, !dbg !53
+// CHECK:STDOUT:   ret ptr %x, !dbg !61
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define %type @_CH.Main.5754c7a55c7cbe4a(%type %x) !dbg !54 {
+// CHECK:STDOUT: define ptr @_CH.Main.04bf2edaaa84aa22(ptr %x) !dbg !62 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret %type %x, !dbg !55
+// CHECK:STDOUT:   ret ptr %x, !dbg !63
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define %type @_CG.Main.5754c7a55c7cbe4a(%type %x) !dbg !56 {
+// CHECK:STDOUT: define ptr @_CH.Main.bda010de15e6a5ad(ptr %x) !dbg !64 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   ret ptr %x, !dbg !65
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: define i32 @_CH.Main.b88d1103f417c6d4(i32 %x) !dbg !66 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   ret i32 %x, !dbg !67
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: define %type @_CH.Main.5754c7a55c7cbe4a(%type %x) !dbg !68 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   %a.var = alloca double, align 8, !dbg !57
-// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !58
-// CHECK:STDOUT:   %H.call.loc25 = call %type @_CH.Main.5754c7a55c7cbe4a(%type %x), !dbg !58
-// CHECK:STDOUT:   %H.call.loc26 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !59
-// CHECK:STDOUT:   %H.call.loc27 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !60
-// CHECK:STDOUT:   %G.call.loc28 = call %type @_CG.Main.5754c7a55c7cbe4a(%type %x), !dbg !61
-// CHECK:STDOUT:   %H.call.loc28 = call %type @_CH.Main.5754c7a55c7cbe4a(%type %G.call.loc28), !dbg !62
-// CHECK:STDOUT:   %G.call.loc29 = call %type @_CG.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !63
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %a.var), !dbg !57
-// CHECK:STDOUT:   %.loc32 = load double, ptr %a.var, align 8, !dbg !64
-// CHECK:STDOUT:   %G.call.loc32 = call double @_CG.Main.66be507887ceee78(double %.loc32), !dbg !65
-// CHECK:STDOUT:   %.loc33 = load double, ptr %a.var, align 8, !dbg !66
-// CHECK:STDOUT:   %H.call.loc33 = call double @_CH.Main.66be507887ceee78(double %.loc33), !dbg !67
-// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 0, ptr %c.var), !dbg !58
-// CHECK:STDOUT:   call void @_CCfn.C.Main.5754c7a55c7cbe4a(ptr %c.var, %type %x), !dbg !68
 // CHECK:STDOUT:   ret %type %x, !dbg !69
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define double @_CH.Main.66be507887ceee78(double %x) !dbg !70 {
+// CHECK:STDOUT: define %type @_CG.Main.5754c7a55c7cbe4a(%type %x) !dbg !70 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret double %x, !dbg !71
+// CHECK:STDOUT:   %a.var = alloca double, align 8, !dbg !71
+// CHECK:STDOUT:   %c.var = alloca {}, align 8, !dbg !72
+// CHECK:STDOUT:   %H.call.loc25 = call %type @_CH.Main.5754c7a55c7cbe4a(%type %x), !dbg !72
+// CHECK:STDOUT:   %H.call.loc26 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !73
+// CHECK:STDOUT:   %H.call.loc27 = call %type @_CH.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !74
+// CHECK:STDOUT:   %G.call.loc28 = call %type @_CG.Main.5754c7a55c7cbe4a(%type %x), !dbg !75
+// CHECK:STDOUT:   %H.call.loc28 = call %type @_CH.Main.5754c7a55c7cbe4a(%type %G.call.loc28), !dbg !76
+// CHECK:STDOUT:   %G.call.loc29 = call %type @_CG.Main.5754c7a55c7cbe4a(%type zeroinitializer), !dbg !77
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 8, ptr %a.var), !dbg !71
+// CHECK:STDOUT:   %.loc32 = load double, ptr %a.var, align 8, !dbg !78
+// CHECK:STDOUT:   %G.call.loc32 = call double @_CG.Main.66be507887ceee78(double %.loc32), !dbg !79
+// CHECK:STDOUT:   %.loc33 = load double, ptr %a.var, align 8, !dbg !80
+// CHECK:STDOUT:   %H.call.loc33 = call double @_CH.Main.66be507887ceee78(double %.loc33), !dbg !81
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 0, ptr %c.var), !dbg !72
+// CHECK:STDOUT:   call void @_CCfn.C.Main.5754c7a55c7cbe4a(ptr %c.var, %type %x), !dbg !82
+// CHECK:STDOUT:   %.loc39_6.1.temp = alloca {}, align 8, !dbg !83
+// CHECK:STDOUT:   call void @_CH.Main.15b1f98bd9cc0c5b(ptr %.loc39_6.1.temp, ptr %c.var), !dbg !83
+// CHECK:STDOUT:   ret %type %x, !dbg !84
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define void @_CCfn.C.Main.b88d1103f417c6d4(ptr %self, i32 %x) !dbg !72 {
+// CHECK:STDOUT: define double @_CH.Main.66be507887ceee78(double %x) !dbg !85 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !73
+// CHECK:STDOUT:   ret double %x, !dbg !86
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define void @_CCfn.C.Main.66be507887ceee78(ptr %self, double %x) !dbg !74 {
+// CHECK:STDOUT: define void @_CCfn.C.Main.b88d1103f417c6d4(ptr %self, i32 %x) !dbg !87 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !75
+// CHECK:STDOUT:   ret void, !dbg !88
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
-// CHECK:STDOUT: define void @_CCfn.C.Main.5754c7a55c7cbe4a(ptr %self, %type %x) !dbg !76 {
+// CHECK:STDOUT: define void @_CH.Main.15b1f98bd9cc0c5b(ptr sret({}) %return, ptr %x) !dbg !89 {
 // CHECK:STDOUT: entry:
-// CHECK:STDOUT:   ret void, !dbg !77
+// CHECK:STDOUT:   ret ptr %x, !dbg !90
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: define void @_CCfn.C.Main.66be507887ceee78(ptr %self, double %x) !dbg !91 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   ret void, !dbg !92
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: define void @_CCfn.C.Main.5754c7a55c7cbe4a(ptr %self, %type %x) !dbg !93 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   ret void, !dbg !94
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
 // CHECK:STDOUT: ; uselistorder directives
-// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 1, 2, 3, 4, 5, 9, 8, 7, 6 }
+// CHECK:STDOUT: uselistorder ptr @llvm.lifetime.start.p0, { 0, 1, 2, 3, 4, 5, 12, 11, 10, 9, 8, 7, 6 }
 // CHECK:STDOUT: uselistorder ptr @_CG.Main.66be507887ceee78, { 0, 1, 2, 4, 3 }
 // CHECK:STDOUT: uselistorder ptr @_CH.Main.b88d1103f417c6d4, { 1, 0 }
 // CHECK:STDOUT: uselistorder ptr @_CH.Main.5754c7a55c7cbe4a, { 0, 1, 2, 3, 7, 6, 5, 4 }
 // CHECK:STDOUT: uselistorder ptr @_CG.Main.5754c7a55c7cbe4a, { 0, 1, 3, 2 }
 // CHECK:STDOUT: uselistorder ptr @_CH.Main.66be507887ceee78, { 4, 3, 2, 1, 0 }
+// CHECK:STDOUT: uselistorder ptr @_CH.Main.15b1f98bd9cc0c5b, { 2, 1, 0 }
 // CHECK:STDOUT:
 // CHECK:STDOUT: attributes #0 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
 // CHECK:STDOUT:
@@ -200,77 +251,94 @@ fn M() {
 // CHECK:STDOUT: !1 = !{i32 2, !"Debug Info Version", i32 3}
 // CHECK:STDOUT: !2 = distinct !DICompileUnit(language: DW_LANG_C, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
 // CHECK:STDOUT: !3 = !DIFile(filename: "call_basic.carbon", directory: "")
-// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 41, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "M", linkageName: "_CM.Main", scope: null, file: !3, line: 44, type: !5, spFlags: DISPFlagDefinition, unit: !2)
 // CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
 // CHECK:STDOUT: !6 = !{}
-// CHECK:STDOUT: !7 = !DILocation(line: 42, column: 3, scope: !4)
-// CHECK:STDOUT: !8 = !DILocation(line: 44, column: 3, scope: !4)
-// CHECK:STDOUT: !9 = !DILocation(line: 47, column: 5, scope: !4)
-// CHECK:STDOUT: !10 = !DILocation(line: 47, column: 3, scope: !4)
-// CHECK:STDOUT: !11 = !DILocation(line: 48, column: 9, scope: !4)
-// CHECK:STDOUT: !12 = !DILocation(line: 48, column: 7, scope: !4)
-// CHECK:STDOUT: !13 = !DILocation(line: 48, column: 3, scope: !4)
-// CHECK:STDOUT: !14 = !DILocation(line: 49, column: 5, scope: !4)
-// CHECK:STDOUT: !15 = !DILocation(line: 49, column: 3, scope: !4)
-// CHECK:STDOUT: !16 = !DILocation(line: 50, column: 9, scope: !4)
-// CHECK:STDOUT: !17 = !DILocation(line: 50, column: 7, scope: !4)
-// CHECK:STDOUT: !18 = !DILocation(line: 50, column: 3, scope: !4)
-// CHECK:STDOUT: !19 = !DILocation(line: 41, column: 1, scope: !4)
-// CHECK:STDOUT: !20 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.b88d1103f417c6d4", scope: null, file: !3, line: 16, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !21 = !DILocation(line: 16, column: 1, scope: !20)
-// CHECK:STDOUT: !22 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.b88d1103f417c6d4", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !23 = !DILocation(line: 31, column: 3, scope: !22)
-// CHECK:STDOUT: !24 = !DILocation(line: 25, column: 3, scope: !22)
-// CHECK:STDOUT: !25 = !DILocation(line: 26, column: 3, scope: !22)
-// CHECK:STDOUT: !26 = !DILocation(line: 27, column: 3, scope: !22)
-// CHECK:STDOUT: !27 = !DILocation(line: 28, column: 5, scope: !22)
-// CHECK:STDOUT: !28 = !DILocation(line: 28, column: 3, scope: !22)
-// CHECK:STDOUT: !29 = !DILocation(line: 29, column: 3, scope: !22)
-// CHECK:STDOUT: !30 = !DILocation(line: 32, column: 5, scope: !22)
-// CHECK:STDOUT: !31 = !DILocation(line: 32, column: 3, scope: !22)
-// CHECK:STDOUT: !32 = !DILocation(line: 33, column: 5, scope: !22)
-// CHECK:STDOUT: !33 = !DILocation(line: 33, column: 3, scope: !22)
-// CHECK:STDOUT: !34 = !DILocation(line: 36, column: 3, scope: !22)
-// CHECK:STDOUT: !35 = !DILocation(line: 38, column: 3, scope: !22)
-// CHECK:STDOUT: !36 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.66be507887ceee78", scope: null, file: !3, line: 16, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !37 = !DILocation(line: 16, column: 1, scope: !36)
-// CHECK:STDOUT: !38 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.66be507887ceee78", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !39 = !DILocation(line: 31, column: 3, scope: !38)
-// CHECK:STDOUT: !40 = !DILocation(line: 25, column: 3, scope: !38)
-// CHECK:STDOUT: !41 = !DILocation(line: 26, column: 3, scope: !38)
-// CHECK:STDOUT: !42 = !DILocation(line: 27, column: 3, scope: !38)
-// CHECK:STDOUT: !43 = !DILocation(line: 28, column: 5, scope: !38)
-// CHECK:STDOUT: !44 = !DILocation(line: 28, column: 3, scope: !38)
-// CHECK:STDOUT: !45 = !DILocation(line: 29, column: 3, scope: !38)
-// CHECK:STDOUT: !46 = !DILocation(line: 32, column: 5, scope: !38)
-// CHECK:STDOUT: !47 = !DILocation(line: 32, column: 3, scope: !38)
-// CHECK:STDOUT: !48 = !DILocation(line: 33, column: 5, scope: !38)
-// CHECK:STDOUT: !49 = !DILocation(line: 33, column: 3, scope: !38)
-// CHECK:STDOUT: !50 = !DILocation(line: 36, column: 3, scope: !38)
-// CHECK:STDOUT: !51 = !DILocation(line: 38, column: 3, scope: !38)
-// CHECK:STDOUT: !52 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.b88d1103f417c6d4", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !53 = !DILocation(line: 20, column: 3, scope: !52)
-// CHECK:STDOUT: !54 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.5754c7a55c7cbe4a", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !55 = !DILocation(line: 20, column: 3, scope: !54)
-// CHECK:STDOUT: !56 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.5754c7a55c7cbe4a", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !57 = !DILocation(line: 31, column: 3, scope: !56)
-// CHECK:STDOUT: !58 = !DILocation(line: 25, column: 3, scope: !56)
-// CHECK:STDOUT: !59 = !DILocation(line: 26, column: 3, scope: !56)
-// CHECK:STDOUT: !60 = !DILocation(line: 27, column: 3, scope: !56)
-// CHECK:STDOUT: !61 = !DILocation(line: 28, column: 5, scope: !56)
-// CHECK:STDOUT: !62 = !DILocation(line: 28, column: 3, scope: !56)
-// CHECK:STDOUT: !63 = !DILocation(line: 29, column: 3, scope: !56)
-// CHECK:STDOUT: !64 = !DILocation(line: 32, column: 5, scope: !56)
-// CHECK:STDOUT: !65 = !DILocation(line: 32, column: 3, scope: !56)
-// CHECK:STDOUT: !66 = !DILocation(line: 33, column: 5, scope: !56)
-// CHECK:STDOUT: !67 = !DILocation(line: 33, column: 3, scope: !56)
-// CHECK:STDOUT: !68 = !DILocation(line: 36, column: 3, scope: !56)
-// CHECK:STDOUT: !69 = !DILocation(line: 38, column: 3, scope: !56)
-// CHECK:STDOUT: !70 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.66be507887ceee78", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !71 = !DILocation(line: 20, column: 3, scope: !70)
-// CHECK:STDOUT: !72 = distinct !DISubprogram(name: "Cfn", linkageName: "_CCfn.C.Main.b88d1103f417c6d4", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !73 = !DILocation(line: 12, column: 3, scope: !72)
-// CHECK:STDOUT: !74 = distinct !DISubprogram(name: "Cfn", linkageName: "_CCfn.C.Main.66be507887ceee78", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !75 = !DILocation(line: 12, column: 3, scope: !74)
-// CHECK:STDOUT: !76 = distinct !DISubprogram(name: "Cfn", linkageName: "_CCfn.C.Main.5754c7a55c7cbe4a", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2)
-// CHECK:STDOUT: !77 = !DILocation(line: 12, column: 3, scope: !76)
+// CHECK:STDOUT: !7 = !DILocation(line: 45, column: 3, scope: !4)
+// CHECK:STDOUT: !8 = !DILocation(line: 47, column: 3, scope: !4)
+// CHECK:STDOUT: !9 = !DILocation(line: 50, column: 5, scope: !4)
+// CHECK:STDOUT: !10 = !DILocation(line: 50, column: 3, scope: !4)
+// CHECK:STDOUT: !11 = !DILocation(line: 51, column: 9, scope: !4)
+// CHECK:STDOUT: !12 = !DILocation(line: 51, column: 7, scope: !4)
+// CHECK:STDOUT: !13 = !DILocation(line: 51, column: 3, scope: !4)
+// CHECK:STDOUT: !14 = !DILocation(line: 52, column: 5, scope: !4)
+// CHECK:STDOUT: !15 = !DILocation(line: 52, column: 3, scope: !4)
+// CHECK:STDOUT: !16 = !DILocation(line: 53, column: 9, scope: !4)
+// CHECK:STDOUT: !17 = !DILocation(line: 53, column: 7, scope: !4)
+// CHECK:STDOUT: !18 = !DILocation(line: 53, column: 3, scope: !4)
+// CHECK:STDOUT: !19 = !DILocation(line: 58, column: 5, scope: !4)
+// CHECK:STDOUT: !20 = !DILocation(line: 58, column: 3, scope: !4)
+// CHECK:STDOUT: !21 = !DILocation(line: 60, column: 5, scope: !4)
+// CHECK:STDOUT: !22 = !DILocation(line: 60, column: 3, scope: !4)
+// CHECK:STDOUT: !23 = !DILocation(line: 62, column: 5, scope: !4)
+// CHECK:STDOUT: !24 = !DILocation(line: 62, column: 3, scope: !4)
+// CHECK:STDOUT: !25 = !DILocation(line: 44, column: 1, scope: !4)
+// CHECK:STDOUT: !26 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.b88d1103f417c6d4", scope: null, file: !3, line: 16, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !27 = !DILocation(line: 16, column: 1, scope: !26)
+// CHECK:STDOUT: !28 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.b88d1103f417c6d4", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !29 = !DILocation(line: 31, column: 3, scope: !28)
+// CHECK:STDOUT: !30 = !DILocation(line: 25, column: 3, scope: !28)
+// CHECK:STDOUT: !31 = !DILocation(line: 26, column: 3, scope: !28)
+// CHECK:STDOUT: !32 = !DILocation(line: 27, column: 3, scope: !28)
+// CHECK:STDOUT: !33 = !DILocation(line: 28, column: 5, scope: !28)
+// CHECK:STDOUT: !34 = !DILocation(line: 28, column: 3, scope: !28)
+// CHECK:STDOUT: !35 = !DILocation(line: 29, column: 3, scope: !28)
+// CHECK:STDOUT: !36 = !DILocation(line: 32, column: 5, scope: !28)
+// CHECK:STDOUT: !37 = !DILocation(line: 32, column: 3, scope: !28)
+// CHECK:STDOUT: !38 = !DILocation(line: 33, column: 5, scope: !28)
+// CHECK:STDOUT: !39 = !DILocation(line: 33, column: 3, scope: !28)
+// CHECK:STDOUT: !40 = !DILocation(line: 36, column: 3, scope: !28)
+// CHECK:STDOUT: !41 = !DILocation(line: 39, column: 3, scope: !28)
+// CHECK:STDOUT: !42 = !DILocation(line: 41, column: 3, scope: !28)
+// CHECK:STDOUT: !43 = distinct !DISubprogram(name: "F", linkageName: "_CF.Main.66be507887ceee78", scope: null, file: !3, line: 16, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !44 = !DILocation(line: 16, column: 1, scope: !43)
+// CHECK:STDOUT: !45 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.66be507887ceee78", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !46 = !DILocation(line: 31, column: 3, scope: !45)
+// CHECK:STDOUT: !47 = !DILocation(line: 25, column: 3, scope: !45)
+// CHECK:STDOUT: !48 = !DILocation(line: 26, column: 3, scope: !45)
+// CHECK:STDOUT: !49 = !DILocation(line: 27, column: 3, scope: !45)
+// CHECK:STDOUT: !50 = !DILocation(line: 28, column: 5, scope: !45)
+// CHECK:STDOUT: !51 = !DILocation(line: 28, column: 3, scope: !45)
+// CHECK:STDOUT: !52 = !DILocation(line: 29, column: 3, scope: !45)
+// CHECK:STDOUT: !53 = !DILocation(line: 32, column: 5, scope: !45)
+// CHECK:STDOUT: !54 = !DILocation(line: 32, column: 3, scope: !45)
+// CHECK:STDOUT: !55 = !DILocation(line: 33, column: 5, scope: !45)
+// CHECK:STDOUT: !56 = !DILocation(line: 33, column: 3, scope: !45)
+// CHECK:STDOUT: !57 = !DILocation(line: 36, column: 3, scope: !45)
+// CHECK:STDOUT: !58 = !DILocation(line: 39, column: 3, scope: !45)
+// CHECK:STDOUT: !59 = !DILocation(line: 41, column: 3, scope: !45)
+// CHECK:STDOUT: !60 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.e8193710fd35b608", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !61 = !DILocation(line: 20, column: 3, scope: !60)
+// CHECK:STDOUT: !62 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.04bf2edaaa84aa22", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !63 = !DILocation(line: 20, column: 3, scope: !62)
+// CHECK:STDOUT: !64 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.bda010de15e6a5ad", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !65 = !DILocation(line: 20, column: 3, scope: !64)
+// CHECK:STDOUT: !66 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.b88d1103f417c6d4", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !67 = !DILocation(line: 20, column: 3, scope: !66)
+// CHECK:STDOUT: !68 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.5754c7a55c7cbe4a", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !69 = !DILocation(line: 20, column: 3, scope: !68)
+// CHECK:STDOUT: !70 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main.5754c7a55c7cbe4a", scope: null, file: !3, line: 23, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !71 = !DILocation(line: 31, column: 3, scope: !70)
+// CHECK:STDOUT: !72 = !DILocation(line: 25, column: 3, scope: !70)
+// CHECK:STDOUT: !73 = !DILocation(line: 26, column: 3, scope: !70)
+// CHECK:STDOUT: !74 = !DILocation(line: 27, column: 3, scope: !70)
+// CHECK:STDOUT: !75 = !DILocation(line: 28, column: 5, scope: !70)
+// CHECK:STDOUT: !76 = !DILocation(line: 28, column: 3, scope: !70)
+// CHECK:STDOUT: !77 = !DILocation(line: 29, column: 3, scope: !70)
+// CHECK:STDOUT: !78 = !DILocation(line: 32, column: 5, scope: !70)
+// CHECK:STDOUT: !79 = !DILocation(line: 32, column: 3, scope: !70)
+// CHECK:STDOUT: !80 = !DILocation(line: 33, column: 5, scope: !70)
+// CHECK:STDOUT: !81 = !DILocation(line: 33, column: 3, scope: !70)
+// CHECK:STDOUT: !82 = !DILocation(line: 36, column: 3, scope: !70)
+// CHECK:STDOUT: !83 = !DILocation(line: 39, column: 3, scope: !70)
+// CHECK:STDOUT: !84 = !DILocation(line: 41, column: 3, scope: !70)
+// CHECK:STDOUT: !85 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.66be507887ceee78", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !86 = !DILocation(line: 20, column: 3, scope: !85)
+// CHECK:STDOUT: !87 = distinct !DISubprogram(name: "Cfn", linkageName: "_CCfn.C.Main.b88d1103f417c6d4", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !88 = !DILocation(line: 12, column: 3, scope: !87)
+// CHECK:STDOUT: !89 = distinct !DISubprogram(name: "H", linkageName: "_CH.Main.15b1f98bd9cc0c5b", scope: null, file: !3, line: 19, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !90 = !DILocation(line: 20, column: 3, scope: !89)
+// CHECK:STDOUT: !91 = distinct !DISubprogram(name: "Cfn", linkageName: "_CCfn.C.Main.66be507887ceee78", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !92 = !DILocation(line: 12, column: 3, scope: !91)
+// CHECK:STDOUT: !93 = distinct !DISubprogram(name: "Cfn", linkageName: "_CCfn.C.Main.5754c7a55c7cbe4a", scope: null, file: !3, line: 12, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !94 = !DILocation(line: 12, column: 3, scope: !93)
diff --git a/toolchain/lower/testdata/function/generic/call_impl_function.carbon b/toolchain/lower/testdata/function/generic/call_impl_function.carbon
new file mode 100644
index 000000000000..3c81f19c024b
--- /dev/null
+++ b/toolchain/lower/testdata/function/generic/call_impl_function.carbon
@@ -0,0 +1,112 @@
+// 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
+//
+// AUTOUPDATE
+// TIP: To test this file alone, run:
+// TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/lower/testdata/function/generic/call_impl_function.carbon
+// TIP: To dump output, run:
+// TIP:   bazel run //toolchain/testing:file_test -- --dump_output --file_tests=toolchain/lower/testdata/function/generic/call_impl_function.carbon
+
+import Core library "io";
+
+interface SomeInterface(T:! type) {
+  fn F(x: T) -> T;
+}
+
+class SomeParam {}
+
+class ImplsSomeInterface {}
+impl ImplsSomeInterface as SomeInterface(i32) {
+  // TODO: There are two identical definitions generated for this, one is unused
+  fn F(x: i32) -> i32 {
+    return x + x;
+  }
+}
+
+// TODO: This asserts with "Mangled name collision".
+// impl ImplsSomeInterface as SomeInterface(SomeParam) {
+  // fn F(x: SomeParam) -> SomeParam {
+    // return {};
+  // }
+// }
+
+
+fn CallGenericMethod(T:! type, U:! SomeInterface(T), x: T) -> T {
+  return U.F(x);
+}
+
+fn G() {
+  var out : i32 = CallGenericMethod(i32, ImplsSomeInterface, 10);
+  Core.Print(out);
+
+  // TODO: Fix above
+  // CallGenericMethod(SomeParam, ImplsSomeInterface, {});
+}
+
+
+// CHECK:STDOUT: ; ModuleID = 'call_impl_function.carbon'
+// CHECK:STDOUT: source_filename = "call_impl_function.carbon"
+// CHECK:STDOUT:
+// CHECK:STDOUT: @printf.int.format = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
+// CHECK:STDOUT:
+// CHECK:STDOUT: define i32 @"_CF.ImplsSomeInterface.Main:SomeInterface.Main"(i32 %x) !dbg !4 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %int.sadd = add i32 %x, %x, !dbg !7
+// CHECK:STDOUT:   ret i32 %int.sadd, !dbg !8
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: define void @_CG.Main() !dbg !9 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %out.var = alloca i32, align 4, !dbg !10
+// CHECK:STDOUT:   call void @llvm.lifetime.start.p0(i64 4, ptr %out.var), !dbg !10
+// CHECK:STDOUT:   %CallGenericMethod.call = call i32 @_CCallGenericMethod.Main.2b28d1a7fa793cbc(i32 10), !dbg !11
+// CHECK:STDOUT:   store i32 %CallGenericMethod.call, ptr %out.var, align 4, !dbg !10
+// CHECK:STDOUT:   %.loc41 = load i32, ptr %out.var, align 4, !dbg !12
+// CHECK:STDOUT:   %print.int = call i32 (ptr, ...) @printf(ptr @printf.int.format, i32 %.loc41), !dbg !13
+// CHECK:STDOUT:   ret void, !dbg !14
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+// CHECK:STDOUT: declare void @llvm.lifetime.start.p0(i64 immarg, ptr captures(none)) #0
+// CHECK:STDOUT:
+// CHECK:STDOUT: define i32 @_CCallGenericMethod.Main.2b28d1a7fa793cbc(i32 %x) !dbg !15 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %F.call = call i32 @"_CF.ImplsSomeInterface.Main:SomeInterface.Main.2b28d1a7fa793cbc"(i32 %x), !dbg !16
+// CHECK:STDOUT:   ret i32 %F.call, !dbg !17
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: declare i32 @printf(ptr, ...)
+// CHECK:STDOUT:
+// CHECK:STDOUT: define i32 @"_CF.ImplsSomeInterface.Main:SomeInterface.Main.2b28d1a7fa793cbc"(i32 %x) !dbg !18 {
+// CHECK:STDOUT: entry:
+// CHECK:STDOUT:   %int.sadd = add i32 %x, %x, !dbg !19
+// CHECK:STDOUT:   ret i32 %int.sadd, !dbg !20
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: attributes #0 = { 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, file: !3, producer: "carbon", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug)
+// CHECK:STDOUT: !3 = !DIFile(filename: "call_impl_function.carbon", directory: "")
+// CHECK:STDOUT: !4 = distinct !DISubprogram(name: "F", linkageName: "_CF.ImplsSomeInterface.Main:SomeInterface.Main", scope: null, file: !3, line: 22, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !5 = !DISubroutineType(types: !6)
+// CHECK:STDOUT: !6 = !{}
+// CHECK:STDOUT: !7 = !DILocation(line: 23, column: 12, scope: !4)
+// CHECK:STDOUT: !8 = !DILocation(line: 23, column: 5, scope: !4)
+// CHECK:STDOUT: !9 = distinct !DISubprogram(name: "G", linkageName: "_CG.Main", scope: null, file: !3, line: 39, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !10 = !DILocation(line: 40, column: 3, scope: !9)
+// CHECK:STDOUT: !11 = !DILocation(line: 40, column: 19, scope: !9)
+// CHECK:STDOUT: !12 = !DILocation(line: 41, column: 14, scope: !9)
+// CHECK:STDOUT: !13 = !DILocation(line: 41, column: 3, scope: !9)
+// CHECK:STDOUT: !14 = !DILocation(line: 39, column: 1, scope: !9)
+// CHECK:STDOUT: !15 = distinct !DISubprogram(name: "CallGenericMethod", linkageName: "_CCallGenericMethod.Main.2b28d1a7fa793cbc", scope: null, file: !3, line: 35, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !16 = !DILocation(line: 36, column: 10, scope: !15)
+// CHECK:STDOUT: !17 = !DILocation(line: 36, column: 3, scope: !15)
+// CHECK:STDOUT: !18 = distinct !DISubprogram(name: "F", linkageName: "_CF.ImplsSomeInterface.Main:SomeInterface.Main.2b28d1a7fa793cbc", scope: null, file: !3, line: 22, type: !5, spFlags: DISPFlagDefinition, unit: !2)
+// CHECK:STDOUT: !19 = !DILocation(line: 23, column: 12, scope: !18)
+// CHECK:STDOUT: !20 = !DILocation(line: 23, column: 5, scope: !18)