[Issue 7177] $ should forward to length by default

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7177



--- Comment #32 from Steven Schveighoffer <schveiguy at yahoo.com> 2013-03-21 13:15:39 PDT ---
(In reply to comment #31)
> Needing to state in the template constraint that a type supports syntax sugar
> appears to be sub-optimal at best. (Whether or not it is used will usually be
> an implementation detail.) IMO adding opDollar using UFCS makes the most sense.

I think the mistake here is the assumption that $ is syntax sugar.  opDollar is
a function, and is not required to return length, otherwise we wouldn't be
having this discussion.

A more semantically named trait would be hasEnd.

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