[Issue 6895] std.traits.isCovariantWith doesn't work for function, function pointer and delegate

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=6895

--- Comment #1 from Alexandru Razvan Caciulescu <alexandru.razvan.c at gmail.com> ---
https://github.com/dlang/phobos/pull/5800

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