cvs commit: fptools/ghc/compiler/rename RnNames.lhs

[Simon Peyton Jones]

simonpj     2005/02/07 04:07:27 PST

  Modified files:
    ghc/compiler/rename  RnNames.lhs 
  Log:
  	------------------------------
  	Improve unused-import warnings
  	------------------------------
  
  	Merge to STABLE
  
  This commit improves the warning messages for unused imports, in the
  case where the 'module A' form is used in an export list.
  
  In doing this, I've realised that the unused-import checking is deficient
  in several ways.  At least
  
  	a) it doesn't recognise that there might be several import statements
  	   for the same module (TcRnTypes.imp_mods has only one entry per
  	   module
  
  	b) it doesn't understand about qualified modules at all
  
  	c) even more fundamentally, it starts from the used Names,
  	   but if the module mentions (say) aliases M.f and N.f for
  	   the same Name, then two imports might be necessary for it
  
  I'm not going to fix these problems now; this message just records them.
  
  Revision  Changes    Path
  1.183     +30 -3     fptools/ghc/compiler/rename/RnNames.lhs