[GHC] #1527: parsing error message that could be improved

[GHC]

#1527: parsing error message that could be improved
-----------------------+----------------------------------------------------
  Reporter:  guest     |          Owner:         
      Type:  bug       |         Status:  new    
  Priority:  lowest    |      Milestone:         
 Component:  Compiler  |        Version:  6.6.1  
  Severity:  minor     |       Keywords:  parser 
Difficulty:  Unknown   |             Os:  Unknown
  Testcase:            |   Architecture:  Unknown
-----------------------+----------------------------------------------------
This is just barely a bug.  The following code uses do notation and gets a
 left arrow in the wrong direction:

 tcRho (TupleE exps) (Check exp_ty)
    = do { tys <- unTupleType exp_ty
         ; checkTuple (text "term" <+> ppr (TupleE exps)) exps tys
         ; exps' -> mapM (uncurry checkRho) (zip exps tys)
         ; return $ ftuple exps'
         }

 The error message is: TxPgm.hs:323:44: Parse error in pattern

 The suggestion of 'pattern' is surprising here, and so is the position of
 the error message.  I know parsing is a black art, and I don't know what
 technology GHC is using, but if this message could be improved that would
 be a Good Thing.

 Norman

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1527>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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