patch applied (ghc): Fix Trac #2538: better error messages when validating types

[Simon Peyton Jones]

Wed Aug 27 08:30:51 PDT 2008  simonpj at microsoft.com
  * Fix Trac #2538: better error messages when validating types
  
  This fix solely concerns error messages, and uses a bit of contextual 
  information to suggest plausible flags.  
  
  It was rather more fiddly to implement than I expected.  Oh well.
  

    M ./compiler/typecheck/TcMType.lhs -41 +61

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20080827153051-1287e-8e703dd6abdce5ab7d15d23ba258a16fa9ba83ce.gz