[Issue 13850] mixin template accepts delegates as function parameters

[d-bugmail at puremagic.com]

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

Max Samukha <maxsamukha at gmail.com> changed:

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                 CC|                            |maxsamukha at gmail.com

--- Comment #2 from Max Samukha <maxsamukha at gmail.com> ---
(In reply to RazvanN from comment #1)
> I cannot reproduce this. The code compiles, runs and exits gracefully.

How does this even work? Implicitly binding the function pointers to `this` is
an extremely confusing semantics. Rather than stacking yet another hack on top
of the pile, we'd better fix the underlying issue, which is member functions
having invalid types.

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