#lang racket/base
(require "grammar3.rkt")
(require "lexer.rkt")
(syntax->datum (parse (tokenize-string
"1 + 2 - 3")))
#lang racket/base
(require "grammar3.rkt")
(require "lexer.rkt")
(syntax->datum (parse (tokenize-string
"1 + 2 - 3")))