[Issue 14478] isInputRange should allow ranges of non-copyable elements

[d-bugmail at puremagic.com]

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

--- Comment #15 from Jonathan M Davis <issues.dlang at jmdavisProg.com> ---
This issue has some similarities to issue #15413, but 15413 deals with ranges
which are non-copyable, whereas this deals with ranges with elements which are
non-copyable (though a range with non-copyable elements would also be
non-copyable if the elements were contained directly in the range as occurs
with some range types - e.g. std.range's only).

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