patch applied (ghc): Warn a bit less often about unlifted bindings.

[Simon Peyton Jones]

Tue Nov 16 09:18:43 PST 2010  simonpj at microsoft.com
  * Warn a bit less often about unlifted bindings.
  
  Warn when
     (a) a pattern bindings binds unlifted values
     (b) it has no top-level bang
     (c) the RHS has a *lifted* type
  
  Clause (c) is new, argued for by Simon M
  
  Eg     x# = 4# + 4#      -- No warning
         (# a,b #) = blah  -- No warning
         I# x = blah       -- Warning

    M ./compiler/hsSyn/HsPat.lhs -2 +22
    M ./compiler/typecheck/TcBinds.lhs -4 +10

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20101116171843-1287e-a6e70fa980a8c66bf4bc2b8abc5e8a3c71d4b33b.gz