patch applied (ghc-6.6/ghc): Refactoring for derived Read

[Ian Lynagh]

Mon Sep  4 06:22:12 PDT 2006  simonpj at microsoft.com
  * Refactoring for derived Read
  
  There are no functional changes in this commit.  But the code for
  derived Read is refactored to make it tidier --- and also to make
  it very easy if we want derived Read to parse the prefix form of
  infix ocnstructors.  
  
  For example,
  	data T = Int `T1` Int
  According to the H98 report, the derived Read instance will parse
  infix uses of T1, but not prefix uses (T1 4 3).  It's arguable that it
  should parse both -- and easy to implement, but it would cause a little bit
  of code bloat.
  
  Similarly records.
  
  Anyway this commit doesn't implement the change; just makes it easy
  to do so.
  

    M ./compiler/typecheck/TcGenDeriv.lhs -19 +29