Tuple unittests

[Ellery Newcomer]

lately I've been getting a lot of screwy error messages whenever I try 
to compile with -unittest:

/home/ellery/Downloads/dmd2044/linux/bin/../../src/phobos/std/typecons.d(425): 
Error: static assert  (is(Tuple!(string,float) == Tuple!(string,float))) 
is false
/home/ellery/Downloads/dmd2044/linux/bin/../../src/phobos/std/typecons.d(413): 
        instantiated from here: Tuple!(string,float)
/home/ellery/Downloads/dmd2044/linux/bin/../../src/phobos/std/typecons.d(424): 
        instantiated from here: slice!(1,3)
/home/ellery/Downloads/dmd2044/linux/bin/../../src/phobos/std/typecons.d(421): 
        instantiated from here: Tuple!(int,string,float,double)
src/dxl/util/Blit.d(554):        instantiated from here: 
Tuple!(int,"i",int,"j")

Actually, it's just this one.

I haven't tried working it down to something small, but I have noted 
that the order in which I send files to dmd affects whether this happens.

any ideas why this is happening?