> I have a module A that re-exports module B, and module B contains only >> class >> instances. Since I'm using -Wall, I get this warning about module B >> exporting nothing. Is there a way to disable this particular warning, >> since >> it is unnecessary in this case? No mailing list messages or GHC >> documentation has told me what to do. >> > > Well, the warning is right that you don't need to re-export module B: > instances are implicitly exported. So you could just remove the export of > "module B", unless there's a reason to export it (such as, you might add > some exported functions or data types to it later)
Hmm, the disappointing result of removing module B from the export list is that now it doesn't show up in the Haddock-generated documentation for module A. Not that there was anything specific in B to document, because it's only instances. But I do want the user to know that importing A also imports B. Sigh... I suppose there's CPP if I really want it. Sean
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