Future of string lambda functions/string predicate functions

[Jesse Phillips]

On Sunday, 11 August 2013 at 18:30:02 UTC, Tyler Jameson Little 
wrote:
> Correct me if I'm wrong, but AFAICT the old behavior was an 
> undocumented feature. I couldn't find string lambdas formally 
> documented anywhere, but lambdas are.

They are documented in std.functional: 
http://dlang.org/phobos/std_functional.html#.binaryFun

Namely because they are not a language feature but instead the 
power of D's other features.

> Comparing function aliases is an optimization, not a feature,

I don't really think it is an optimization either. What Andrei 
was requesting was a definition of what constitutes equality for 
equality for lambdas. However none of what I said should be taken 
to contradict your point that one can still use a named function 
to keep types equal.

> If the user needs the old behavior, he/she can do this today 
> with an actual function

This assumes you are not receiving a sorted range from a third 
party library and passing it to another third party.