this is my primary "complaint" about D; i strongly prefer languages with algebraic datatypes and pattern matching built in. other than that it does indeed look like a beautiful language.

ironically, i haven't really used D for the same reason i haven't really used rust - i've yet to have a project for which ocaml wasn't a better choice. (i know both D and rust address things ocaml doesn't, but they aren't the things i tend to need for my personal projects.)