(defparser javascript-script
    ((program source-elements) $1) ; Starting production
  [....]
    
  ;; Expressions
  ((primary-expression :this) 
       (make-special-value :symbol :this :start $s :end $e))
  ((primary-expression :function_continuation) 
       (make-special-value :symbol :function_continuation :start $s :end $e))
  ((primary-expression :identifier) 
       (make-identifier :name $1 :start $s :end $e))
  ((primary-expression literal) 
       $1)
  ((primary-expression array-literal) 
       $1)
  ((primary-expression object-literal) 
       $1)
  ((primary-expression :left-paren expression :right-paren) 
       $2)

  [....]