Yes this has been requested a few times.
I just want to point out that while I like the idea (seeing how
well it works in C#), I also think it should be optionally how it
is now. There are times when you want to pass and object as ref
for optimization only, and aren't actually modifying the value
(like Matrix Multiplication for example). In these cases, the way
D works right now is nice, because it hides that detail from the
end user.
Still, I think 'ref'/'out' should be require at call-site by
default, to avoid any gotchas.
I also don't see any problem with UFCS really. I mean, using that
syntax is pseudo-OOP and implies the first parameter might be
modified in the function.
