nl_tokens: Shifts data from the stack
pl_tokens: function ReadCommand ( args ) { var parsed = new statements . ArgumentStatement ( args ) ; for ( var i = 0 ; i < parsed . args . length ; i ++ ) { var placeVar = parsed . args [ i ] ; if ( ! ( placeVar . child instanceof statements . VariableStatement || placeVar . child instanceof statements . FunctionStatement ) ) throw new SyntaxError ( 'Expected variable' ) ; } this . <mask> = parsed . args ; }