%DEFINE-COMPONENT-INLINE-METHODS contains the following LOOP form:
(loop for data = rest then (cddr data) while data for key = (first data) for value = (second data) ...)
However, if you look at LOOP's BNF in the specification, you'll see that termination clauses *must* appear after :for clauses.
CLISP rightfully signals a warning.
-T.