-;;; FIXME: This is broken because of compiler bug 123: the compiler
-;;; optimizes the type test to T, so it never gets a chance to raise a
-;;; runtime error. (It used to work under the IR1 interpreter just
-;;; because the IR1 interpreter doesn't try to optimize TYPEP as hard
-;;; as the byte compiler does.)
-#+nil (assert (raises-error? (typep #(11) '(simple-array undef-type 1))))