nl_tokens: Dumps long stack traces for exceptions having a cause () method .
pl_tokens: function getFullErrorStack ( ex ) { var ret = ex . stack ; if ( ex . cause && typeof ( ex . cause ) === 'function' ) { var cex = ex . cause ( ) ; if ( cex ) { ret += '\nCaused by: ' + getFullErrorStack ( cex ) ; } } return <mask> ; }