recursive import

[Serge D. Mechveliani]

People,

Who knows, please, how usable are currently recursive module imports 
in Haskell, in GHC ?
Is it essentially more difficult to `make' and support a project 
which has 50 modules, and half of all the module pairs import each 
other? 
Is recursive import in Haskell-98 ?

Thank you in advance for explanation.

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