(:*******************************************************:)
(: Test: K-SeqExprCast-276                               :)
(: Written by: Frans Englich                             :)
(: Date: 2006-10-05T18:29:37+02:00                       :)
(: Purpose: '1999--12' is an invalid lexical representation for xs:gYearMonth. :)
(:*******************************************************:)
xs:gYearMonth("1999--12")