sbcl 1.0.20 released

SBCL 1.0.20 has been released, the release notes follow:

changes in sbcl-1.0.20 relative to 1.0.19:
  * minor incompatible change: OPTIMIZE qualities
    SB-C::STACK-ALLOCATE-DYNAMIC-EXTENT, SB-C::STACK-ALLOCATE-VECTOR,
    and SB-C::STACK-ALLOCATE-VALUE-CELLS no longer exist. See documentation
    and SB-EXT:*STACK-ALLOCATE-DYNAMIC-EXTENT* for details.
  * documentation: some slot access efficiency guidelines have been
    added to the user manual.
  * optimization: ASSOC-IF, ASSOC-IF-NOT, MEMBER-IF, MEMBER-IF-NOT,
    RASSOC, RASSOC-IF, and RASSOC-IF-NOT are now equally efficient
    as ASSOC and MEMEBER.
  * optimization: calls to ASSOC, MEMBER, and RASSOC can be transformed
    to more efficient EQ-comparison versions more often.
  * optimization: enhanced derivation of DOLIST iteration variable type
    for constant lists.
  * optimization: constant folding of simple (LIST ...) forms as DOLIST
    arguments.
  * optimization: runtime lookup of function definitions can be
    elided in more cases, eg: (let ((x 'foo)) (funcall foo)).
  * optimization: compiler is able to derive the return type of
    (AREF (THE STRING X) Y) as being CHARACTER.
  * optimization: CLRHASH on empty hash-tables no longer does pointless
    work. (thanks to Alec Berryman)
  * optimization: REPLACE deftransforms don't punt when :START1 or
    :START2 is given
  * bug fix: compiling DESTRUCTURING-BIND on constant list arguments
    no longer emits a code deletion note. (reported by Andrew
    Gasparovic)
  * bug fix: bogus odd-number-of-keywords STYLE-WARNINGs from calls to
    functions with an odd number of &OPTIONAL arguments, a &REST
    argument, and one or more &KEY arguments at the call site.
  * bug fix: STYLE-WARNINGs for functions with both &OPTIONAL and &KEY
    arguments appeared at call sites as well.
  * bug fix: fixed #425; CLOSE drops input buffers from streams, so
    READ-LINE &co can no longer read from them afterwards. (reported
    by Damien Cassou)
  * bug fix: fixed #427: unused local aliens no longer cause compiler
    breakage. (reported by Stelian Ionescu, Andy Hefner and Stanislaw
    Halik)
  * bug fix: non-local exit from a WITH-ALIEN form no longer causes
    alien-stack leakage. (reported by Andy Hefner)
  * bug fix: PROGV signals an error when an attempt to violate declared
    type of a variable or bind a constant is made.
  * bug fix: SET signals an error when an attempt to violate declared
    type of a variable is made.
  * bug fix: restart computation during the execution of a restart
    test function no longer causes infinite recursion. (reported by
    Michael Weber)
  * bug fix: calling SB-COVER:REPORT with a non-directory pathname now
    signals an error. (thanks to Pierre Mai)
  * bug fix: EXPORT left symbol unexported in conflict situations.
    (thanks to Michael Weber)
  * bug fix: correctly handle name conflicts involving CL:NIL.
    (thanks to Michael Weber)
  * bug fix: RESOLVE-CONFLICT restart for name conflicts handles
    conflicts arising from USEing package with conflicting symbols
    correctly. (thanks to Michael Weber)

-- 
Juho Snellman


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