[Issue 18628] @disable this(this) erroneously adds `__postblit` member

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18628

--- Comment #2 from RazvanN <razvan.nitu1305 at gmail.com> ---
What I'm saying is that the output of hasMember is correct, but the output of
hasElaborateCopyConstructor most certainly isn't, but, in my opinion, the fix
should be in phobos, not in dmd.

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