[Issue 12062] std.range.flatten

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12062

greenify <greeenify at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #3 from greenify <greeenify at gmail.com> ---
I guess it's not well known, but `joiner` without arguments behaves like
`flatten`:

https://dlang.org/phobos/std_algorithm_iteration.html#.joiner

It just flattens one dimensions though.

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