sbcl-1.2.8

changes in sbcl-1.2.8 relative to sbcl-1.2.7:
  * enhancement: better error and warning messages. (lp#1314767, lp#736383)
  * enhancement: backtrace for invalid argument count produces the exact
    supplied arguments including the extra ones, on x86, x86-64 and ARM.
  * enhancement: a STYLE-WARNING is signaled for DEFSTRUCT accessors which
    are used before the structure is defined; similarly for the predicate.
  * optimization: FORMAT NIL with only ~a and string arguments is transformed
    into CONCATENATE.
  * optimization: POSITION and FIND when inlined into code that is compiled
    with qualities of safety < 2 and speed > space will no longer signal
    an error on circular lists, but will potentially loop forever if given
    no :END constraint. As was always the case, calls that are not inlined
    are safe regardless of lexical policy.
  * bug fix: CLOS methods compiled with (OPTIMIZE (DEBUG 0))
    no longer cause debugger failure when printing a backtrace
  * bug fix: more resilience to deleted code. (lp#1308328, lp#1390544)
  * bug fix: the CLHS example of MAKE-LOAD-FORM involving TREE-WITH-PARENT
    did not work, and now it does.
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