cyclic import bug in 6.6.1

[Serge D. Mechveliani]

Dear GHC developers,

I an half-stuck now due to the  ghc-6.6.1  bug of  `undefined reference'
at the stage of linking the executable.

I am almost sure that this is due to cyclic import.
There already was cyclic import, and the whole program worked correct.
Now, I have split one large module into two modules, and there appeared 
more cyclic imports. Now, it `makes' the package and does `install', but 
cannot link the executable for `main'.
 
There are about 30 modules in the project, and 4-5 of them form a 
cycle by import.

Please, whom I need to send the source archive to ?

I can reduce this bug report project many times,
but I suspect that in this particular case you can easily spot the place 
in the project as it is.
Can you ?

Regards,

-----------------
Serge Mechveliani
mechvel at botik.ru