Major Section: RELEASE-NOTES
Fixed a bug in
cw-gstack that was causing a hard error when attempting
to report on a forced assumption. Thanks to Jared Davis for pointing this
out and sending an example that helped us to determine a fix.
set-backchain-limit to the set of legal events that can be
encapsulate forms and books. Thanks to John Cowles for
bringing this issue to our attention.
Fixed a bug that broke
wet. Thanks to David Rager for bringing this
bug to our attention.
Guard verification now evaluates ground subexpressions (those with no free variables) when computing the guard conjecture for the body of a function. Thanks to Jared Davis for useful conversations leading to this change. See verify-guards, in particular its ``Note on computation of guard conjectures and evaluation'' near the end of that topic, for more details.
Added a warning when a
theory-invariant is redefined. Thanks to Jared
Davis for suggesting a warning in this case and providing an informative
theory-invariants are now maintained more completely,
as they are checked at the end of every event except for events executed on
behalf of an
include-book or the second pass of an
Fixed the handling of runic designators to match their specification
(see theories), so that disabling the name of a
disables all rules generated for that event.
(For those who do numerous builds using feature
currently only OpenMCL and multi-threaded SBCL by default:) You can speed up
builds by adding the following parameter to
make, under conditions
Arranged that traced functions (see trace$) are automatically untraced when events are undone (for example see ubt), at least for most underlying Common Lisp implementations.
defun-sk now creates non-executable functions, which allows
stobjs to be used where they had previously been prohibited. More
generally, the user now has control over
declare forms to be used by
defun'd function; see defun-sk. Thanks to Sandip for
pointing out the need for such a modification.
Definition rules are now treated, at least by default, as truly
first-class definitions. In particular,
:expand hints use the
definition rule by default. You may specify
:install-body nil to get the previous behavior of
See definition, and you may choose a previously-installed
rule to provide the current body; see set-body. Also see rule-classes for
details of the
:install-body field, and see hints to see a new
directive for controlling expansion. The
:with directive for
hints can even direct the use of a
rewrite rule for expansion!
Thanks to various people, including Sandip Ray and Rob Sumners, for
discussions on the issue of the applicability of
:definition rules for
Constraints for functional instantiation now use the original definition rather than a simplified (``normalized'') version of it.
Fixed a bug that caused the prompt to stay the same when guard-checking is off (see set-guard-checking) and raw-mode is changed (see set-raw-mode).
Lemma names in directory
books/ordinals have been changed by replacing
& and replacing
V. We made this change
because backslash is an escape character and hence disappears unless it is
Fixed proof-tree output so that failed non-proof events do not cause the proof-tree to be re-printed. Thus for example, if you have already advanced the checkpoint marker, it will not be reset by subequent failed non-proof events. Thanks to Pete Manolios and Peter Dillinger for bringing this bug to our attention.
Fixed a bug that was preventing the printing of stobj fields as constants instead of numbers in certain cases. (Note that this bug only affected printing, not soundness.) Thanks to Eric Smith for bringing this problem to our attention and providing the following example (which now works fine).
(defstobj st fld1 fld2) (in-theory (disable update-nth)) (defund run (st) (declare (xargs :stobjs (st))) ;adding this didn't seem to help.. st)
;works great; *fld1* prints as *fld1* (thm (equal (update-nth *fld1* 'abc st) (car (cons x y))))
;*fld1* gets printed as 0, presumably because the call to run intervenes. (thm (equal (update-nth *fld1* 'abc (run st)) (car (cons x y))))
progn now allows the use of macros defined within its bodies
even when at the event level, as illustrated by the following example.
(progn (defmacro my-defun (&rest args) `(defun ,@args)) (my-defun g (x) x))Thanks to Anna Slobodova for bringing this issue to our attention. A related change is that all arguments of
prognmust now be embedded event forms (see embedded-event-form), so use
er-progninstead if this is not the case.
The change to
progn mentioned above also fixes a bug in handling
local events inside a
progn that is inside an
in a book. For example, the following form formerly caused an error.
(encapsulate () (defun foo (x) x) (progn (local (defun bar (x) x)) (defun abc (x) x)))
We fixed two bugs in
puff*. The first,
brought to our attention by Eric Smith (who we thank), caused a cryptic error
message when puffing a command with no subsidiary stored events; try, for
(encapsulate () (value-triple 3)). The second was due to a
failure to restore the
acl2-defaults-table. Suppose for example that
we have certified the book
foo.lisp, which contains
) followed by some definitions and/or theorems. Now
suppose we start ACL2 and execute the following.
(include-book "foo") (defthm test-thm (equal x x) :rule-classes nil)If we now execute
1, ACL2 will roll back the world to before the
include-book; then ``puff'' the include-book, which will leave us in
programmode; and finally skip re-execution of the
defthmbecause such events are skipped in
programmode. The fix is to re-install the
acl2-defaults-tableimmediately after the
include-bookto its pre-
A new event,
make-event, provides something like macros that take
state. For example, one can use it to put tests into certified books, do
proof search, and generate new function names. Many examples appear in
books/make-event/. See make-event. Thanks to Bob Boyer and
Jared Davis for useful feedback and to Warren Hunt, David Rager, and Sandip
Ray for helpful discussions leading to some of the examples in directory
In support of
make-event, which is described in the preceding
certify-book has a new keyword argument,
that controls whether the result of expanding
make-event forms is
written out to a file. See certify-book; and for a discussion of book
expansion files, see make-event.
We fixed a soundness bug that did not correctly detect
For example, the following event was admitted.
(encapsulate () (local (encapsulate () (local (progn (program))) ; or, (local (with-output :off summary (program))) (set-irrelevant-formals-ok t) (defun foo (x) (declare (xargs :measure (acl2-count x))) (1+ (foo x))))) (defthm inconsistent nil :hints (("Goal" :use foo)) :rule-classes nil))
A new value for guard checking,
:none, is now allowed. If you
:none, then no guard checking will
take place (but raw Lisp code will not be executed in this case). As a
result, you should never see a guard violation, even for calls of
program mode functions. We thank Pete Manolios, who has long wanted
this feature, and also Peter Dillinger, for asking for it. New documentation
explains the interaction between the defun-mode and the value supplied
set-guard-checking. See guard-evaluation-table,
see guard-evaluation-examples-script, and
In the course of adding the guard-checking value
:none described in
the paragraph above, we eliminated an optimization that eliminated guard
checking for some recursive calls of
:logic mode mutually-recursive
functions that have not had their guards verified. But we doubt that this
change will be noticed by any users!)
The ACL2 hyper-card has been enhanced, thanks to David Rager, with a listing
of ``Useful EMACS Commands'' to match comments in
Users contributed books following the
unicode (Jared Davis),
(Sandip Ray and J Moore).
Made some improvements to
books/Makefile-generic (a file discussed
elsewhere; see book-makefiles). In particular, improved handling of
.acl2 files for
(Only OpenMCL and, with feature
:acl2-mv-as-values, GCL) Fixed a bug that
was causing proclaiming to fail when definitions are submitted interactively.
The default stack size has been increased for several lisps.
(Very technical) A restriction has been weakened on the use of
stobjs under a call of an ACL2 evaluator (
simple-translate-and-eval). Now, the error can only take place for
stobj names that occur in the term being evaluated. Thanks to Erik
Reeber for bringing this issue to our attention.
The notion of ``ancestor'' has been changed slightly. This notion is used by
extended metafunctions and break-rewrite (see extended-metafunctions
and see brr@), and also with backchain limits (see backchain-limit and
see set-backchain-limit). Basically, each time a hypothesis is encountered
during application of a rewrite rule, that hypothesis is pushed (after
instantiating and negating) onto the current list of ancestors before it is
rewritten. However, hypotheses of the form
(equal var term), where
var is free (see free-variables), had not been included in the ancestors
(equiv var (double-rewrite term)) where
equiv is a
known equivalence relation). Now such ``binding hypotheses'' are
included in a special way in ancestors data structures. In particular,
(null (mfc-ancestors mfc)) will now be true if and only if the term being
rewritten is part of the current goal as opposed to a hypothesis from a rule
encountered during backchaining, even if that hypothesis is a binding
hypothesis. Thanks to Dave Greve for bringing this issue to our attention.
Termination and induction analysis now continue through both arguments of
prog2$, not just the second. (Normally, the gathering up of
tests stops at function calls; but it continued through the second argument
prog2$, and now it will continue through both arguments.) Thanks to
Sol Swords for discussion leading to this change.
The ACL2 distribution is now kept on the http server rather than the ftp server (but the home page has not been moved). Thanks to Robert Krug for letting us know that some ACL2 users have found it inconvenient to fetch ACL2 using ftp.
books/README.html has been renamed to
since some browsers don't show the former in the directory listing.