NIL is not of type C::BYTE-LAMBDA-INFO (error during compile)
When compiling this from a file:
(defun c6 () (declare (optimize (debug 0) (speed 0))) (case 0 ((4 -30) (ignore-errors 0))) nil)
this happens
Type-error in KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER: NIL is not of type C::BYTE-LAMBDA-INFO [Condition of type TYPE-ERROR] [...] 0: (KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER "<error finding name>" #.(SYSTEM:INT-SAP #xF7C238FC) #<Alien (* SYSTEM:SYSTEM-AREA-POINTER) at #xF7C2348C> (80 16)) 1: (KERNEL::INTERNAL-ERROR #.(SYSTEM:INT-SAP #xF7C2348C) #<unused-arg>) 2: ("call_into_lisp+#x74 [#x8059400] /home/dietz/cmucl-2018-01/bin/lisp") [...]