dub dustmite

[Vlad Levenfeld via Digitalmars-d-learn]

I'm trying to reduce a bug with dub dustmite feature and I must 
be doing it wrong somehow, my regular dub output looks like this:

   source/experimental.d(2403): Error: struct 
experimental.Product!(int[], int[]).Product no size yet for 
forward reference
ulong[2]
   source/experimental.d(2454): Error: template instance 
experimental.Product!(int[], int[]) error instantiating
   source/experimental.d(2462):        instantiated from here: 
by!(int[], int[])
   FAIL 
.dub/build/application-debug-linux.posix-x86_64-dmd_2067-44246AA2375AB6C7D895600135F734E4/ 
engine_vx executable
   Error executing command run:
   dmd failed with exit code 1.

and then when I run this command

   dub dustmite ~/dubdust --compiler-regex="Product no size yet"

I get

   Executing dustmite...
   None => No
   object.Exception at dustmite.d(243): Initial test fails

It seems like a pretty simple case, I'm not sure what's going on.