Combining Module Interfaces

[Ashley Yakeley]

Is there a way to combine interfaces into a single file?

If I have modules A and B, I want to create a module C with all the 
exported definitions of A and B such that I can compile against C.hi file 
without needing the A.hi and B.hi files.

I tried this:

module C (module A,module B) where
     {
     import A;
     import B;
     }

...but if I attempt to compile against C.hi using definitions from A and 
B, GHC complains if I don't have A.hi and B.hi. I want C.hi to contain 
everything that A.hi and B.hi do.

-- 
Ashley Yakeley, Seattle WA