Just found this blog page. Fortress is a language quite different from D because it tries to be innovative (while D tries to be mostly a collection of well known good solutions) but it author Guy Steele is a good language designer, so some of the ideas of Fortress are nice. This post is about the Maybe type in Fortress and its consequences (you can guess it...? in Fortress things are notnull by default): http://projectfortress.sun.com/Projects/Community/blog/MaybeType
Bye, bearophile
