On Tuesday, 10 December 2013 at 17:28:26 UTC, Andrei Alexandrescu wrote:
We have only(x) (http://dlang.org/phobos/std_range.html#.only) to be a collection of exactly one value, but not a type for "a value of type T or nothing at all"
Option is being upgraded to handle an arbitrary (but compile time known) amount of values: https://github.com/D-Programming-Language/phobos/pull/1743
