id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
1527,parsing error message that could be improved,guest,,"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",bug,closed,lowest,,Compiler,6.6.1,fixed,parser,,Unknown/Multiple,Unknown/Multiple,,Unknown,,,,