[Issue 9149] Disallow converting delegates to const

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=9149

--- Comment #8 from timon.gehr at gmx.ch ---
(In reply to Sobirari Muhomori from comment #6)
> really? https://dpaste.dzfl.pl/ba8fdf6711e3

No, you are right, DMD accepts it even though it is invalid. Not sure why I
claimed otherwise (maybe I accidentally tested with the wrong compiler).

Anyway, void delegate() shouldn't convert to const(void delegate()) implicitly.

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