patch applied (ghc-6.8/ghc): Improve the situation for Trac #959: civilised warning instead of a trace msg

[Ian Lynagh]

Mon Nov 19 04:29:38 PST 2007  simonpj at microsoft.com
  * Improve the situation for Trac #959: civilised warning instead of a trace msg
  
  This doesn't fix the root cause of the bug, but it makes the report
  more civilised, and points to further info.
  

    M ./compiler/deSugar/DsBinds.lhs -15 +23
    M ./compiler/prelude/TysPrim.lhs -1 +3
    M ./compiler/typecheck/TcHsSyn.lhs -43 +63