[Issue 21862] Taking address of non-static method without "this" should not be allowed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21862

--- Comment #4 from Eyal <eyal at weka.io> ---
The type of a delegate's "funcptr" should either be a "void*" or a new kind of
non-callable "ret delegatefuncptr(args)" type.

That will allow everything correct to happen while making the incorrectly typed
programs at least take some effort.

If changing the funcptr type to void* causes problems - those are better
problems to have/solve than this problem.

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