languagePragParseError loc =
throw $ mkSrcErr $ unitBag $
(mkPlainErrMsg loc $
- text "cannot parse LANGUAGE pragma: comma-separated list expected")
+ vcat [ text "Cannot parse LANGUAGE pragma"
+ , text "Expecting comma-separated list of language options,"
+ , text "each starting with a capital letter"
+ , nest 2 (text "E.g. {-# LANGUAGE RecordPuns, Generics #-}") ])
unsupportedExtnError :: SrcSpan -> String -> a
unsupportedExtnError loc unsup =
throw $ mkSrcErr $ unitBag $
mkPlainErrMsg loc $
- text "unsupported extension: " <> text unsup
+ text "Unsupported extension: " <> text unsup
optionsErrorMsgs :: [String] -> [Located String] -> FilePath -> Messages