[Issue 19882] Expected 'undefined identifier' error when type comparing

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19882

--- Comment #7 from kinke at gmx.net ---
(In reply to SrMordred from comment #6)
> "DMD now also accepts `is(int == undefined_id)`."
> Isn´t this bad?
> I got stuck several minutes on this bug because the compiler didn´t tell me
> that I misspelled an identifier.

Me too, that's why I reverted the 'fix' and reopened this issue.

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