Reply to dsimcha,
I've been thinking a little about the idea of returning tuples from functions, w.r.t. Bugzilla 2628 (http://d.puremagic.com/issues/show_bug.cgi?id=2628). Would it be feasible to solve this by making struct[index] for any struct w/o an opIndex overload equivalent to struct.tupleof[index]? This would be trivial syntactic sugar, but would allow user-defined tuples in Phobos to look like a builtin tuple, be returned from functions, etc., while changing very little under the hood. Furthermore, for functions that take a tuple, we could allow structs to be implicitly cast to tuples, e.g.:struct Foo { uint u; float f; } void doStuff(uint myInt, float myFloat) {} Foo foo; doStuff(foo); // Implicitly casts to foo.tupleof, works.
I like the first part some (but not without reservations). As for the second bit... I don't like it. It would make overload resolution to tricky, if not at the compiler level than at the eyeball level.
