Currently, attempting to produce the arglist for make-instance given
some class name causes an error because the
compute-applicable-methods-using-classes function isn't defined by
ECL. Attached is a patch that adds a stub version of the function
which at least makes it possible to type make-instance calls without
interruption by an error. In fact, you even get an arglist, although
it isn't necessarily correct - for instance, given a defclass such as
(defclass foo () (myslot :initarg myinitarg)), Slime presents the
arglist as (make-instance 'foo &rest initargs &key (myslot
clos::+initform-unsupplied+)), using the slot name rather than the
initarg name. I haven't investigated where that comes from, but it's
better than nothing.