The value NIL is not of type SB-C::VOP

[Paul F. Dietz]

(lambda (a)
  (declare (type fixnum a))
  (if (not (< a 0 a))
      0
      (block b4 (shiftf a 0))))

==>

The value
  NIL
is not of type
  SB-C::VOP
[...]
  0: ((LABELS SB-C::UNCHAIN-JUMPS :IN SB-C::IR2-OPTIMIZE-JUMPS) #<SB-C::VOP :INFO SB-C:BRANCH-IF :ARGS NIL :RESULTS NIL :CODEGEN-INFO (#<SB-ASSEM:LABEL 1> NIL (:G))>)
  1: (SB-C::IR2-OPTIMIZE-JUMPS #<SB-C:COMPONENT :NAME (LAMBDA (A)) {1005AB0853}>)
  2: (SB-C::%COMPILE-COMPONENT #<SB-C:COMPONENT :NAME (LAMBDA (A)) {1005AB0853}>)
  3: (SB-C::COMPILE-COMPONENT #<SB-C:COMPONENT :NAME (LAMBDA (A)) {1005AB0853}>)
[...]

[Stas Boukarev (stassats)]

552c28ff4cdd9b5084255c18e667b152c200d5b8