dawgfoto/dranges — pull request #4 by enjoysmath (2012-06-08 01:57:35+00:00)
Title: This fixes that issue I made.  D2 doesn't allow this() for structs.

This is probably a D bug. It should call your default-arg ctor since it is not a this(), however when you try to use it without passing an argument, it compiles but throws that exception (see issue).