Dependency of discriminating functions on method combinations

Hi, Computing an effective method depends on the generic function's method combination. But is it also the case for computing the discriminating function? I don't see why it should in theory, but evidence seems to suggest otherwise[1]. Maybe it does for technical reasons? Thanks. Footnotes: [1] In SBCL for instance, flushing the effective method cache is not enough for direct modifications to a generic function's method combination to take effect on the next call. -- Resistance is futile. You will be jazzimilated. Lisp, Jazz, Aïkido: http://www.didierverna.info