;   (ERROR SB-KERNEL::FLOAT-DECODING-ERROR SB-KERNEL::X)
;   (ERROR SB-KERNEL::FLOAT-DECODING-ERROR SB-KERNEL::X)
   2 SB-KERNEL:FILL-POINTER-ERROR
   1 SB-IMPL::%FAILED-AVER
   1 SB-KERNEL:CHECK-TYPE-ERROR-TRAP
;     (ERROR "Missing a GC feature")
debugger invoked on a SB-INT:SIMPLE-FILE-ERROR in thread
  Failed to find the TRUENAME of /usr/share/sbcl/source/: