Crate fac

Fac is a build system.

Modules

build	Rules and types for building the stuff.
git	Support interaction with git
refset	A nice type for holding sets of references defined by address. This can only really be used with either 'static or with arena allocators or the like. But in those case, a RefSet ought to be your most efficient way to store a set of items, provided you can ensure that you don't ever allocate a duplicate.
version	A module with just the version in it.