nl_tokens: ### AssertionError
pl_tokens: function AssertionError ( message , _props , ssf ) { var extend = exclude ( 'name' , 'message' , 'stack' , 'constructor' , 'toJSON' ) , props = extend ( _props || { } ) ; // default values this . message = message || 'Unspecified AssertionError' ; this . showDiff = false ; // copy from properties for ( var key in props ) { this [ key ] = props [ key ] ; } // capture stack trace ssf = ssf || arguments . callee ; if ( ssf && Error . captureStackTrace ) { Error . captureStackTrace ( this , ssf ) ; } else { this . stack = new Error ( ) . <mask> ; } }