[GHC] #1405: Make ghc (stage1) be compilable by non-GHC

[GHC]

#1405: Make ghc (stage1) be compilable by non-GHC
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    Reporter:  Isaac Dupree  |        Owner:         
        Type:  task          |       Status:  new    
    Priority:  normal        |    Milestone:  _|_    
   Component:  Compiler      |      Version:  6.6.1  
    Severity:  normal        |   Resolution:         
    Keywords:                |   Difficulty:  Unknown
          Os:  Unknown       |     Testcase:         
Architecture:  Unknown       |  
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Comment (by simonpj):

 The other thing to watch out for is that we keep GHC in a state in which
 it can be compiled by several '''earlier''' versions of GHC.  I forget
 what our current earlier-version threshold is (Simon M would know), but in
 doing your refactoring please be careful to maintain this property.  We
 don't want to pull up the ladder after ourselvese too quickly!

 Simon

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1405>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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