// language mash-ups are very useful; here's an example from the OMeta/JS implementation

ometa OMetaJSParser <: BSJSParser {
  srcElem = spaces foreign(BSOMetaParser, `grammar):r sc -> r
          | super(`srcElem)
}

ometa OMetaJSTranslator <: BSJSTranslator {
  Grammar = foreign(BSOMetaTranslator, `Grammar)
}