[Issue 20904] dip1000 implicit conversion delegates error

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20904

kinke <kinke at gmx.net> changed:

           What    |Removed                     |Added
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                 CC|                            |kinke at gmx.net

--- Comment #1 from kinke <kinke at gmx.net> ---
> `A` isn't used but compilation succeeds if you remove it.

That (well, you meant `blah`) makes it definitely interesting - I think it
might be related to a missing type merge then, as that's the probable cause for
a mangling issue wrt. `void delegate()` too, see
https://github.com/ldc-developers/ldc/issues/3098#issuecomment-506527495.

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