Hi. Reading the Haskell 98 Report (section 9.2), I have found a possible problem. The lexical syntax supports Unicode, however this is not true for the newline: newline -> return linefeed | return | linefeed | formfeed The Unicode standard adds two additional characters: U+2028 LINE SEPARATOR U+2029 PARAGRAPH SEPARATOR The Unicode Character Database, also defines two general categories: Zl = Separator, line Zp = Separator, paragraph The Zl category only contains the LINE SEPARATOR character and the Zp category only contains the PARAGRAPH SEPARATOR character. So, IMHO, the lexical syntax should be changed in : newline -> return linefeed | return | linefeed | formfeed | uniLine | uniPara uniLine -> any Unicode character defined as line separator uniPara -> any Unicode character defined as paragraph separator or, alternatively: uniLine -> LINE SEPARATOR uniPara -> PARAGRAPH SEPARATOR Manlio Perillo