changes in sbcl-1.2.6 relative to sbcl-1.2.5:

  * enhancement: SERVE-EVENTS uses the poll() system call in lieu of
    select() if the OS has the former. Previously poll() was used
    only if waiting on exactly one file descriptor.
  * enhancement: efficiency of access to untagged structure slots is improved
    on x86-64, and the order of slots in memory is exactly as specified by
    defstruct, simplifying use of structures as arguments to foreign calls.
  * bug fix: SB-DEBUG:ARG now works in all TRACE options which evaluate forms.
   (lp#1357826)
  * bug fix: GC memory corruption during internal memory handling.
  * bug fix: duplicate effective-slot-definition objects as compared
    by EQ on name could be present in CLASS-SLOTS of a class whose
    metaclass was structure-class or condition-class. (lp#1049423)
  * bug fix: HANDLER-BIND with empty bindings works again; regression in
    1.2.5. (lp#1388707)
  * bug fix: ATOMIC-INCF works on structure slots in interpreted code.
    (lp#1381867)
  * bug fix: MAKE-ARRAY properly handles character types like (eql #\a) and
    (member #\a #\c). (lp#1392068)
  * bug fix: READ sometimes accidentally preserved a whitespace character
    after a token when it should not have. (lp#327790)
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