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

[d-bugmail at puremagic.com]

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

--- Comment #6 from SrMordred <patric.dexheimer at gmail.com> ---
"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.

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