EXP is equal to VAR. The result is to evaluate EXP and bind the result to VAR.
The tail of VARS can be either nil or a symbol VAR which should hold a list
-of arguments,in which case each argument is evaluated and the resulting
+of arguments, in which case each argument is evaluated and the resulting
new list is re-bound to VAR.
After VARS is handled, BODY is evaluated in the new environment."