Data.ByteString in base fails to build?

[Malcolm Wallace]

> >      Data/ByteString.hs:301:14: Not in scope: `empty'
> > 
> > at different locations.  Indeed, the module does appear to both
> > export "empty" and use it many times, but does not define it.
> 
> Hmm. Should be in Data.ByteString.Base. 
> 
> It's in my copy. Is it possible your shadow build directory hasn't
> sym linked libraries/base/Data/ByteString/Base.hs ?

Apologies.  I think the cause was some interface files left behind after
a previous build.  For some reason the build system did not detect the
dependencies correctly, and re-built Data.ByteString before D.B.Base,
hence importing an older interface.

make distclean before rebuilding should fix it.

Regards,
    Malcolm