[Issue 12293] forward should be moved to std.functional

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12293

--- Comment #6 from Andrej Mitrovic <andrej.mitrovich at gmail.com> ---
(In reply to monarchdodra from comment #5)
> What !?
> You suggested it. I just told you to go through with it.

*Facepalm*. It appears I did. Sorry for this. :>

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