[Bug libstdc++/106067] [13/14/15/16 Regression] Error on implicit conversion to std::function: 'static constexpr bool std::_Function_handler<...>...' used before its definition

[ppalka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106067

--- Comment #7 from Patrick Palka <ppalka at gcc dot gnu.org> ---
(In reply to Patrick Palka from comment #6)
> Thanks for the ping, and for the reduced testcase! The original example
> works for me on trunk after r16-7053 (and on 15/14 release branches), so
> ultimately it's another variant of PR122494 / PR123814. I'll add the reduced
> testcase to the testsuite and close this PR once r16-7053 gets backported to
> all release branches.  (It doesn't seem very worthwhile to add the original
> testcase to the libstdc++ testsuite since this is squarely a front-end bug)
Oops, that should be r16-7055