[Bug libstdc++/119899] Custom invoke has name collision with std::invoke, without using namespace std

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119899

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
http://en.cppreference.com/w/cpp/language/adl
https://en.wikipedia.org/wiki/Argument-dependent_name_lookup
http://stackoverflow.com/questions/8111677/what-is-argument-dependent-lookup-aka-adl-or-koenig-lookup