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Boaz Brickner
bfc4d2b127
This is a follow up of #6082, which added support for reference types, but not for return types. C++ Interop Demo: ```carbon // main.carbon library "Main"; import Core library "io"; import Cpp inline ''' struct C { auto Inc() -> void { ++x; } int x = 0; }; auto GetC() -> C& { static C c; return c; } '''; fn Run() -> i32 { Core.Print(Cpp.GetC()->x); Cpp.GetC()->Inc(); Core.Print(Cpp.GetC()->x); Cpp.GetC()->Inc(); Core.Print(Cpp.GetC()->x); return 0; } ``` ```shell $ bazel build toolchain:carbon && bazel-bin/toolchain/carbon compile main.carbon && bazel-bin/toolchain/carbon link main.o --output=demo && ./demo 0 1 2 ``` **Without this change**: ```shell main.carbon:19:14: error: semantics TODO: `Unsupported: return type: C &` Core.Print(Cpp.GetC()->x); ^~~~~~~~~~ ``` Part of #6148.