[Issue 14478] isInputRange failed to recognize some ranges

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14478

--- Comment #4 from Ketmar Dark <ketmar at ketmar.no-ip.org> ---
yet at least some std.algorithm algorithms are able to work with such ranges.
chain works ok, filter works too. others will do too, i think, with `(ref a)`
predicates. yet current implementation forbids such usage.

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