LISP 6.1 变量的基础

CL-USER> (defun foo(x)
	   (format t "Parameter:~a~%" x)
	   (let ((x 2))
	     (format t "Out LET: ~a~%" x)
	     (let ((x 3))
	       (format t "Inner LET: ~a~%" x))
	     (format t "Out LET: ~a~%" x))
	   (format t "Parameter:~a~%" x))
	       
FOO

CL-USER> (foo 1)
Parameter:1
Out LET: 2
Inner LET: 3
Out LET: 2
Parameter:1
NIL

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原文链接：blog.csdn.net/fengda2870/article/details/9089081