On Wed, Oct 17, 2007 at 03:35:37PM -0300, Isaac Dupree wrote:

Serge D. Mechveliani wrote:

...

People,

here is a more precise report about empty _export_ in ghc-6.8.1-candidate:

I use -------------------------------- module M1 (f, module M2) where import M2 () f = ... --------------------------------

in the situation when M1 imports some instances from M2 and reexports these instances.

And ghc-6.8.1-candidate reports

"Warning: The export item `module M2' exports nothing"

1) Can I fix anything here? 2) Should this warning be different?

The warning is true. The instances will be exported even if `module M2' is omitted from the export list, so that export item exports nothing.

I see. Thank you. ----------- Mechveliani