patch applied (ghc-6.12/ghc): MERGED: Fix Trac #3823, plus warning police in TcRnDriver

[Ian Lynagh]

Fri Jan 22 06:08:48 PST 2010  Ian Lynagh <igloo at earth.li>
  * MERGED: Fix Trac #3823, plus warning police in TcRnDriver
  simonpj at microsoft.com**20100120094221
   Ignore-this: 8856cf1ab48733180d0cfa800b535317
  
   The immediate reason for this patch is to fix #3823. This was
   rather easy: all the work was being done but I was returning
   type_env2 rather than type_env3.
  
   An unused-veriable warning would have shown this up, so I fixed all
   the other warnings in TcRnDriver.  Doing so showed up at least two
   genuine lurking bugs.  Hurrah.

    M ./compiler/typecheck/TcRnDriver.lhs -59 +69
    M ./compiler/typecheck/TcTyClsDecls.lhs -2 +2

View patch online:
http://darcs.haskell.org/ghc-6.12/ghc/_darcs/patches/20100122140848-3fd76-f8f9bbae5c81d0870ea94123ea8345fb875dc73d.gz