tree 5ec1938645eeceac089b21dc54b075271f3763ad
parent b7ff8932340eb6b1caf37b79e95f7365019cf2fd
author Arthur O'Dwyer <arthur.j.odwyer@gmail.com> 1610400557 -0500
committer Copybara-Service <copybara-worker@google.com> 1611866049 -0800

[libc++] Support immovable return types in std::function.

LWG reflector consensus is that this was a bug in libc++.
(In particular, MSVC also will fix it in their STL, soon.)
Bug originally discovered by Logan Smith.

Also fix `std::function<const void()>`, which should work
the same way as `std::function<void()>` in terms of allowing
"conversions" from non-void types.

Differential Revision: https://reviews.llvm.org/D94452

GitOrigin-RevId: f9b6fd269b6fd2b085c3537b6730a02503430ef0