[Issue 12583] Allow user defined "retro" range

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=12583

Steven Schveighoffer <schveiguy at yahoo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |schveiguy at yahoo.com

--- Comment #1 from Steven Schveighoffer <schveiguy at yahoo.com> ---
Fully agree with this.

In fact, retro could accept any type that supports .retro(), even non-ranges.

I wonder if foreach_reverse could be specialized to call this on bidirectional
ranges...

Note, this is a similar pattern to 'put', I wonder if there is a commonality
here we can extract into a "D design pattern".

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