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In the following Lisp REPL interaction:
CL-USER> (defparameter *unison* 0)
*UNISON*
CL-USER> (member *unison* '(*unison*))
NIL
why is nil returned?
Because the
*unison*variable is bound to0, and the list has only a*unison*symbol since it’s quoted. Try this in comparison:This will actually evaluate the second
*unison*which returns0, resulting in a(0)list.