using values-list with &rest fails

[Samuel Jimenez]

(defun f (&rest data)
   (let (foo bar)
      (setf (values foo bar) (values-list data))
      (list foo)))

fails with

The value
    NIL
  is not of type
    SB-C:STORAGE-CLASS

On first glance, this appears to be somehow optimizer-related, as adding bar to the final list causes the function to behave as expected.

SBCL 1.4.14

(:X86-64 :64-BIT :64-BIT-REGISTERS :ALIEN-CALLBACKS :ANSI-CL :C-STACK-IS-CONTROL-STACK :CALL-SYMBOL :COMMON-LISP :COMPARE-AND-SWAP-VOPS :CYCLE-COUNTER :FLOAT-EQL-VOPS :FP-AND-PC-STANDARD-SAVE :GENCGC :IEEE-FLOATING-POINT :INTEGER-EQL-VOP :LINKAGE-TABLE :LITTLE-ENDIAN :OS-PROVIDES-DLOPEN :OS-PROVIDES-PUTWC :PACKAGE-LOCAL-NICKNAMES :SB-DOC :SB-DYNAMIC-CORE :SB-EVAL :SB-FUTEX :SB-LDB :SB-PACKAGE-LOCKS :SB-QSHOW :SB-SAFEPOINT :SB-SAFEPOINT-STRICTLY :SB-SIMD-PACK :SB-SOURCE-LOCATIONS :SB-THREAD :SB-THRUPTION :SB-UNICODE :SB-WTIMER :SBCL :STACK-ALLOCATABLE-CLOSURES :STACK-ALLOCATABLE-FIXED-OBJECTS :STACK-ALLOCATABLE-LISTS :STACK-ALLOCATABLE-VECTORS :STACK-GROWS-DOWNWARD-NOT-UPWARD :UNDEFINED-FUN-RESTARTS :UNWIND-TO-FRAME-AND-CALL-VOP :WIN32)

[Stas Boukarev (stassats)]

7ae2d3b7ece1901cd7cc7615ec0585c4ee309fc5