[Issue 17661] New isInputRange rejects valid input range

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=17661

--- Comment #7 from hsteoh at quickfur.ath.cx ---
According to what Martin Nowak just said, there is no dmd bug, is that right? 
So we only need to fix Phobos.

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