[Issue 13850] mixin template accepts delegates as function parameters

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=13850

--- Comment #4 from Salih Dincer <salihdb at hotmail.com> ---
(In reply to Max Samukha from comment #2)
> ... stacking yet another hack
> on top of the pile, we'd better fix the underlying issue, which is member
> functions having invalid types.

You are right, because there is alias!

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