#1527: parsing error message that could be improved
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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
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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/>
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