| My application program (called DoCon), | being ported recently to ghc-6.0.1, | needs to provide the user (program) with the following visibility | scope of items: | all the proper DoCon export | + most of Haskell standard library | + FiniteMap, and maybe some others | module DExport | (module DPrelude, module Categs, ... -- DoCon proper export | ... | module Data.FiniteMap, | module Prelude, module List, module Ratio, module Random | ) | | Is this a reasonable way to arrange the thing? Yes, this looks fine to me. | Now, the ghc-6.0.1 compiler reports | | Compiling DExport ... | Warning: `++' is exported by `module Prelude' and `module List' .. | | I think that these overlaps are harmless, and the compiler will still | set the intended definitions for (++), foldr, etc., | without any danger. Correct. You can suppress these warnings with -fno-warn-duplicate-exports | Aslo proper DoCon export fron DExport has many similar overlaps. | I think that it is often useful to be able to import an item from | different modules. Is this reasonable? It's fine. The warning is only saying that either one of the exports would do by itself for (++). Perhaps there should not be a warning when both export specifiers are 'module X'. | Generally, I accept these overlap warnings as useful ones. | But at the installation, such strange numerous warnings on DExport | will frighten the user. | Therefore, Makefile has, probably, to compile the last module | DExport with this kind of messages switched off. Yes, -fno-warn-duplicate-exports should do the job. You can even put it in the file thus: {-# OPTIONS -fno-warn-duplicate-exports #-} Simon