patch applied (ghc): Fix defaulting for overloaded strings

[Simon Peyton Jones]

Wed Feb 21 02:36:45 PST 2007  simonpj at microsoft.com
  * Fix defaulting for overloaded strings
  
  This patch fixes the typechecking of the default declaration itself,
  when overloaded strings are involved.  It also documents the behaviour
  in the user manual.
  
  nofib/spectral/power should work again now!
  

    M ./compiler/typecheck/TcDefaults.lhs -16 +32
    M ./compiler/typecheck/TcSimplify.lhs -10 +16
    M ./docs/users_guide/glasgow_exts.xml -1 +25