hi, i seem to have run into a module system bug, which is illustrated by the following example: module A where data T = T module B where import A hiding (T()) -- note the parens after T v = T Hugs complains that "T" is an undefined constructor. This would be the correct behaviour if T didn't have the () after it, as both the type and the constructors by the name T should be hidden. however, the parens indicate that the type/class T should be hidden, and also all the constructors listed in the parens. since the constructor T is not listed, it should not be hidden. basically, if a name has parens after it, it always refers to a type/class. this is not a big thing, but is ocasionally useful, and more importantly, it is nice when one can load a program with both GHC and Hugs, which i am glad to say happens more and more often. bye iavor -- ================================================== | Iavor S. Diatchki, Ph.D. student | | Department of Computer Science and Engineering | | School of OGI at OHSU | | http://www.cse.ogi.edu/~diatchki | ==================================================