patch applied (ghc): Major patch to fix reporting of unused imports

[Ian Lynagh]

Mon Jul  6 04:25:03 PDT 2009  simonpj at microsoft.com
  * Major patch to fix reporting of unused imports
  Ignore-this: 3b5ecdd880474493d73bdbdc0fa0b782
  
  This patch, joint work between and Ian and Simon, fixes Trac #1074
  by reporting unused import declarations much more accuratly than 
  before.  The specification is described at 
  
  http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/UnusedImports
  
  The implementation is both easier to understand than before, and shorter
  too.  
  
  Also fixed are #1148, #2267
  
  Also fixed is -ddump-minimal imports, which now works properly, fixing 
  Trac #1792.
  
  

    M ./compiler/hsSyn/HsImpExp.lhs -6 +7
    M ./compiler/main/HscMain.lhs -6 +7
    M ./compiler/rename/RnEnv.lhs -2 +24
    M ./compiler/rename/RnNames.lhs -221 +175
    M ./compiler/typecheck/TcRnDriver.lhs -1 +1
    M ./compiler/typecheck/TcRnMonad.lhs -1 +3
    M ./compiler/typecheck/TcRnTypes.lhs -1 +5

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20090706112503-1287e-c315d4aac830c95f5bfa40e67ef6749d23e42bdf.gz