Invalid form leads to a failed AVER

[Paul F. Dietz]

(defun f41 ()
  (restart-bind (((1) (restart-bind nil 3)))
    ))

==>

failed AVER:
    (AND (EQ (SB-C::CTRAN-KIND SB-C::START) :INSIDE-BLOCK)
         (NOT (SB-C::BLOCK-DELETE-P BLOCK)))

This is not high priority, since the restart-bind form is invalid, but failed AVERs should not be how such errors are signaled.

[Stas Boukarev (stassats)]

4ddc738c36b7929daef2c31018a26c482f133caf