[Issue 12583] Allow user defined "retro" range

[via Digitalmars-d-bugs]

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

--- Comment #7 from Steven Schveighoffer <schveiguy at yahoo.com> ---
I've altered my opinion slightly on this. See:
http://forum.dlang.org/post/op.xeuot6g2eav7ka@stevens-macbook-pro-2.local

Long story short, I think this is still a good idea, but the member function
should NOT be named retro.

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