C1007   Function does not end with RETURN

     Explanation:  You have defined a function that ends with a statement
     other than RETURN.  This warning can occur if you have specified a
     statement earlier in the function definition, or if there is no RETURN
     statement in the function definition.  In the case where you have not
     specified a RETURN statement, the compiler generates NIL as the default
     return value.

     Action:  Check first to see if there is a RETURN statement anywhere
     in the function definition, and add one if there is not.  If you have
     specified one or more RETURN statements within the function, add a
     RETURN NIL to the end of the function definition.