https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66284
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- Created attachment 39806 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39806&action=edit Patch to remove special-case for reference_wrapper. This patch makes it work as desired. We need to fix 3-4 test cases too which explicitly check for the current behaviour (it's by design, matching Boost.Function). I submitted a defect report, with a proposed change to make the copy + move constructors say "if f’s target is a <DEL>callable object passed via</DEL><INS>specialization of</INS> reference_wrapper or a function pointer."
