src := read_file("./math.txt")
	tokens := lex.lex(src)
	when DEBUG {
		lex.print_ast(tokens)
		fmt.println("========")
	}
	ast := shuntingyard.shunting_yard(tokens)
	when DEBUG {
		lex.print_ast(ast)

	for {
		inp_buf := make([dynamic]byte, 256)
		defer delete(inp_buf)
		fmt.print("> ")
		char_count, err := os.read(os.stdin, inp_buf[:])
		if err < 0 {
			fmt.println("[!] ERROR", err)
			return
		}
		// Remove new line
		src := string(inp_buf[:char_count - 1])
		// src := read_file("./math.txt")
		tokens := lex.lex(src)
		when DEBUG {
			lex.print_ast(tokens)
			fmt.println("========")
		}
		ast := shuntingyard.shunting_yard(tokens)
		when DEBUG {
			lex.print_ast(ast)
		}
		my_vm := vm.new_vm(ast[:])
		defer vm.delete_vm(my_vm)
		res := vm.execute(my_vm)
		fmt.println(res)

	my_vm := vm.new_vm(ast[:])
	defer vm.delete_vm(my_vm)
	res := vm.execute(my_vm)
	fmt.println(res)