[Issue 7957] std.functional untuple/untupleReversed too

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=7957

--- Comment #1 from RazvanN <razvan.nitu1305 at gmail.com> ---
PR : https://github.com/dlang/phobos/pull/5780

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