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Changes from V8.6beta1 to V8.6
==============================
Kernel
- Fixed critical bug #5248 in VM long multiplication on 32-bit
architectures. Was there only since 8.6beta1, so no stable release impacted.
Other bug fixes in universes, type class shelving,...
Changes from V8.5 to V8.6beta1
==============================
Kernel
- A new, faster state-of-the-art universe constraint checker.
Specification language
- Giving implicit arguments explicitly to a constant with multiple
choices of implicit arguments does not break any more insertion of
further maximal implicit arguments.
- Ability to put any pattern in binders, prefixed by quote, e.g.
"fun '(a,b) => ...", "λ '(a,(b,c)), ...", "Definition foo '(x,y) := ...".
It expands into a "let 'pattern := ..."
Tactics
- Flag "Bracketing Last Introduction Pattern" is now on by default.
- Flag "Regular Subst Tactic" is now on by default: it respects the
initial order of hypothesis, it contracts cycles, it unfolds no
local definitions (common source of incompatibilities, fixable by
"Unset Regular Subst Tactic").
- New flag "Refolding Reduction", now disabled by default, which turns
on refolding of constants/fixpoints (as in cbn) during the reductions
done during type inference and tactic retyping. Can be extremely
expensive. When set off, this recovers the 8.4 behaviour of unification
and type inference. Potential source of incompatibility with 8.5 developments
(the option is set on in Compat/Coq85.v).
- New flag "Shrink Abstract" that minimalizes proofs generated by the abstract
tactical w.r.t. variables appearing in the body of the proof.
On by default and deprecated. Minor source of incompatibility
for code relying on the precise arguments of abstracted proofs.
- Serious bugs are fixed in tactic "double induction" (source of
incompatibilities as soon as the inductive types have dependencies in
the type of their constructors; "double induction" remains however
deprecated).
- In introduction patterns of the form (pat1,...,patn), n should match
the exact number of hypotheses introduced (except for local definitions
for which pattern can be omitted, as in regular pattern-matching).
- Tactic scopes in Ltac like constr: and ltac: now require parentheses around
their argument.
- Every generic argument type declares a tactic scope of the form "name:(...)"
where name is the name of the argument. This generalizes the constr: and ltac:
instances.
- When in strict mode (i.e. in a Ltac definition), if the "intro" tactic is
given a free identifier, it is not bound in subsequent tactics anymore.
In order to introduce a binding, use e.g. the "fresh" primitive instead
(potential source of incompatibilities).
- New tactics is_ind, is_const, is_proj, is_constructor for use in Ltac.
- New goal selectors. Sets of goals can be selected by listing integers
ranges. Example: "1,4-7,24: tac" focuses "tac" on goals 1,4,5,6,7,24.
- For uniformity with "destruct"/"induction" and for a more natural
behavior, "injection" can now work in place by activating option
"Structural Injection". In this case, hypotheses are also put in the
context in the natural left-to-right order and the hypothesis on
which injection applies is cleared.
- Tactic "contradiction" (hence "easy") now also solve goals with
hypotheses of the form "~True" or "t<>t" (possible source of
incompatibilities because of more successes in automation, but
generally a more intuitive strategy).
- Option "Injection On Proofs" was renamed "Keep Proof Equalities". When
enabled, injection and inversion do not drop equalities between objects
in Prop. Still disabled by default.
- New tactics "notypeclasses refine" and "simple notypeclasses refine" that
disallow typeclass resolution when typechecking their argument, for use
in typeclass hints.
- Integration of LtacProf, a profiler for Ltac.
- Reduction tactics now accept more fine-grained flags: iota is now a shorthand
for the new flags match, fix and cofix.
- The ssreflect subterm selection algorithm is now accessible to tactic writers
through the ssrmatching plugin.
- When used as an argument of an ltac function, "auto" without "with"
nor "using" clause now correctly uses only the core hint database by
default.
Hints
- Revised the syntax of [Hint Cut] to follow standard notation for regexps.
- Hint Mode now accepts "!" which means that the mode matches only if the
argument's head is not an evar (it goes under applications, casts, and
scrutinees of matches and projections).
- Hints can now take an optional user-given pattern, used only by
[typeclasses eauto] with the [Filtered Unification] option on.
Typeclasses
- Many new options and new engine based on the proof monad. The
[typeclasses eauto] tactic is now a multi-goal, multi-success tactic.
See reference manual for more information. It is planned to
replace auto and eauto in the following version. The 8.5 resolution
engine is still available to help solve compatibility issues.
Program
- The "Shrink Obligations" flag now applies to all obligations, not only
those solved by the automatic tactic.
- "Shrink Obligations" is on by default and deprecated. Minor source of
incompatibility for code relying on the precise arguments of
obligations.
Notations
- "Bind Scope" can once again bind "Funclass" and "Sortclass".
General infrastructure
- New configurable warning system which can be controlled with the vernacular
command "Set Warnings", or, under coqc/coqtop, with the flag "-w". In
particular, the default is now that warnings are printed by coqc.
- In asynchronous mode, Coq is now capable of recovering from errors and
continue processing the document.
Tools
- coqc accepts a -o option to specify the output file name
- coqtop accepts --print-version to print Coq and OCaml versions in
easy to parse format
- Setting [Printing Dependent Evars Line] can be unset to disable the
computation associated with printing the "dependent evars: " line in
-emacs mode
- Removed the -verbose-compat-notations flag and the corresponding Set
Verbose Compat vernacular, since these warnings can now be silenced or
turned into errors using "-w".
XML protocol
- message format has changed, see dev/doc/changes.txt for more details.
Many bug fixes, minor changes and documentation improvements are not mentioned
here.
Changes from V8.5pl2 to V8.5pl3
===============================
Critical bugfix
- #4876: Guard checker incompleteness when using primitive projections
Other bugfixes
- #4780: Induction with universe polymorphism on was creating ill-typed terms.
- #4673: regression in setoid_rewrite, unfolding let-ins for type unification.
- #4754: Regression in setoid_rewrite, allow postponed unification problems to remain.
- #4769: Anomaly with universe polymorphic schemes defined inside sections.
- #3886: Program: duplicate obligations of mutual fixpoints.
- #4994: Documentation typo.
- #5008: Use the "md5" command on OpenBSD.
- #5007: Do not assume the "TERM" environment variable is always set.
- #4606: Output a break before a list only if there was an empty line.
- #5001: metas not cleaned properly in clenv_refine_in.
- #2336: incorrect glob data for module symbols (bug #2336).
- #4832: Remove extraneous dot in error message.
- Anomaly in printing a unification error message.
- #4947: Options which take string arguments are not backwards compatible.
- #4156: micromega cache files are now hidden files.
- #4871: interrupting par:abstract kills coqtop.
- #5043: [Admitted] lemmas pick up section variables.
- Fix name of internal refine ("simple refine").
- #5062: probably a typo in Strict Proofs mode.
- #5065: Anomaly: Not a proof by induction.
- Restore native compiler optimizations, they were disabled since 8.5!
- #5077: failure on typing a fixpoint with evars in its type.
- Fix recursive notation bug.
- #5095: non relevant too strict test in let-in abstraction.
- Ensuring that the evar name is preserved by "rename".
- #4887: confusion between using and with in documentation of firstorder.
- Bug in subst with let-ins.
- #4762: eauto weaker than auto.
- Remove if_then_else (was buggy). Use tryif instead.
- #4970: confusion between special "{" and non special "{{" in notations.
- #4529: primitive projections unfolding.
- #4416: Incorrect "Error: Incorrect number of goals".
- #4863: abstract in typeclass hint fails.
- #5123: unshelve can impact typeclass resolution
- Fix a collision about the meta-variable ".." in recursive notations.
- Fix printing of info_auto.
- #3209: Not_found due to an occur-check cycle.
- #5097: status of evars refined by "clear" in ltac: closed wrt evars.
- #5150: Missing dependency of the test-suite subsystems in prerequisite.
- Fix a bug in error printing of unif constraints
- #3941: Do not stop propagation of signals when Coq is busy.
- #4822: Incorrect assertion in cbn.
- #3479 parsing of "{" and "}" when a keyword starts with "{" or "}".
- #5127: Memory corruption with the VM.
- #5102: bullets parsing broken by calls to parse_entry.
Various documentation improvements
Changes from V8.5pl1 to V8.5pl2
===============================
Critical bugfix
- Checksums of .vo files dependencies were not correctly checked.
- Unicode-to-ASCII translation was not injective, leading in a soundness bug in
the native compiler.
Other bugfixes
- #4097: more efficient occur-check in presence of primitive projections
- #4398: type_scope used consistently in "match goal".
- #4450: eauto does not work with polymorphic lemmas
- #4677: fix alpha-conversion in notations needing eta-expansion.
- Fully preserve initial order of hypotheses in "Regular Subst Tactic" mode.
- #4644: a regression in unification.
- #4725: Function (Error: Conversion test raised an anomaly) and Program
(Error: Cannot infer this placeholder of type)
- #4747: Problem building Coq 8.5pl1 with OCaml 4.03.0: Fatal warnings
- #4752: CoqIDE crash on files not ended by ".v".
- #4777: printing inefficiency with implicit arguments
- #4818: "Admitted" fails due to undefined universe anomaly after calling
"destruct"
- #4823: remote counter: avoid thread race on sockets
- #4841: -verbose flag changed semantics in 8.5, is much harder to use
- #4851: [nsatz] cannot handle duplicated hypotheses
- #4858: Anomaly: Uncaught exception Failure("hd"). Please report. in variant
of nsatz
- #4880: [nsatz_compute] generates invalid certificates if given redundant
hypotheses
- #4881: synchronizing "Declare Implicit Tactic" with backtrack.
- #4882: anomaly with Declare Implicit Tactic on hole of type with evars
- Fix use of "Declare Implicit Tactic" in refine.
triggered by CoqIDE
- #4069, #4718: congruence fails when universes are involved.
Universes
- Disallow silently dropping universe instances applied to variables
(forward compatible)
- Allow explicit universe instances on notations, when they can apply
to the head reference of their expansion.
Build infrastructure
- New update on how to find camlp5 binary and library at configure time.
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that had buildlink paths show up in the Coq_config module, and added a
patch from upstream to allow compilation with 4.03.
Changes:
Critical bugfix
- The subterm relation for the guard condition was incorrectly defined on
primitive projections (#4588)
Plugin development tools
- add a .merlin target to the makefile
Various performance improvements (time, space used by .vo files)
Other bugfixes
- Fix order of arguments to Big.compare_case in ExtrOcamlZBigInt.v
- Added compatibility coercions from Specif.v which were present in Coq 8.4.
- Fixing a source of inefficiency and an artificial dependency in the printer in the congruence tactic.
- Allow to unset the refinement mode of Instance in ML
- Fixing an incorrect use of prod_appvect on a term which was not a product in setoid_rewrite.
- Add -compat 8.4 econstructor tactics, and tests
- Add compatibility Nonrecursive Elimination Schemes
- Fixing the "No applicable tactic" non informative error message regression on apply.
- Univs: fix get_current_context (bug #4603, part I)
- Fix a bug in Program coercion code
- Fix handling of arity of definitional classes.
- #4630: Some tactics are 20x slower in 8.5 than 8.4.
- #4627: records with no declared arity can be template polymorphic.
- #4623: set tactic too weak with universes (regression)
- Fix incorrect behavior of CS resolution
- #4591: Uncaught exception in directory browsing.
- CoqIDE is more resilient to initialization errors.
- #4614: "Fully check the document" is uninterruptable.
- Try eta-expansion of records only on non-recursive ones
- Fix bug when a sort is ascribed to a Record
- Primitive projections: protect kernel from erroneous definitions.
- Fixed bug #4533 with previous Keyed Unification commit
- Win: kill unreliable hence do not waitpid after kill -9 (Close #4369)
- Fix strategy of Keyed Unification
- #4608: Anomaly "output_value: abstract value (outside heap)".
- #4607: do not read native code files if native compiler was disabled.
- #4105: poor escaping in the protocol between CoqIDE and coqtop.
- #4596: [rewrite] broke in the past few weeks.
- #4533 (partial): respect declared global transparency of projections in unification.ml
- #4544: Backtrack on using full betaiota reduction during keyed unification.
- #4540: CoqIDE bottom progress bar does not update.
- Fix regression from 8.4 in reflexivity
- #4580: [Set Refine Instance Mode] also used for Program Instance.
- #4582: cannot override notation [ x ]. MAY CREATE INCOMPATIBILITIES, see #4683.
- STM: Print/Extraction have to be skipped if -quick
- #4542: CoqIDE: STOP button also stops workers
- STM: classify some variants of Instance as regular `Fork nodes.
- #4574: Anomaly: Uncaught exception Invalid_argument("splay_arity").
- Do not give a name to anonymous evars anymore. See bug #4547.
- STM: always stock in vio files the first node (state) of a proof
- STM: not delegate proofs that contain Vernac(Module|Require|Import), #4530
- Don't fail fatally if PATH is not set.
- #4537: Coq 8.5 is slower in typeclass resolution.
- #4522: Incorrect "Warning..." on windows.
- #4373: coqdep does not know about .vio files.
- #3826: "Incompatible module types" is uninformative.
- #4495: Failed assertion in metasyntax.ml.
- #4511: evar tactic can create non-typed evars.
- #4503: mixing universe polymorphic and monomorphic variables and definitions in sections is unsupported.
- #4519: oops, global shadowed local universe level bindings.
- #4506: Anomaly: File "pretyping/indrec.ml", line 169, characters 14-20: Assertion failed.
- #4548: Coqide crashes when going back one command
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long, so I will not include it here, but details can be found in the
CHANGES file in the source. (the previous version was V8.4.)
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Problems found with existing digests:
Package nhc98 distfile nhc98src-1.22.tar.gz
a8adc8f22371998ee0657bc0e01058a57d876abc [recorded]
81975fcb5f1dda5efeaabc30ce8c6dceae55e591 [calculated]
Problems found locating distfiles:
Package gcc-aux: missing distfile ada-bootstrap.i386.dragonfly.36A.tar.bz2
Package gcc-aux: missing distfile ada-bootstrap.i386.freebsd.84.tar.bz2
Package gcc-aux: missing distfile ada-bootstrap.x86_64.dragonfly.36A.tar.bz2
Package gcc-aux: missing distfile ada-bootstrap.x86_64.freebsd.84.tar.bz2
Package gcc-aux: missing distfile ada-bootstrap.x86_64.solaris.511.tar.bz2
Package gcc5-aux: missing distfile ada-bootstrap.i386.dragonfly.36A.tar.bz2
Package gcc5-aux: missing distfile ada-bootstrap.i386.freebsd.84.tar.bz2
Package gcc5-aux: missing distfile ada-bootstrap.x86_64.dragonfly.36A.tar.bz2
Package gcc5-aux: missing distfile ada-bootstrap.x86_64.freebsd.84.tar.bz2
Package gcc5-aux: missing distfile ada-bootstrap.x86_64.solaris.511.tar.bz2
Package ghc7: missing distfile ghc-7.6.3-boot-i386-unknown-freebsd.tar.xz
Package icc11: missing distfile l_cproc_p_11.1.080.tgz
Package jini: missing distfile jini-1_2_1_001-src.zip
Package oo2c: missing distfile oo2c_32-2.0.11.tar.bz2
Package openjdk7: missing distfile openjdk7/bootstrap-jdk-1.7.76-freebsd-10-amd64-20150301.tar.xz
Package openjdk7: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-5-i386-20150301.tar.xz
Package openjdk7: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-6-i386-20150301.tar.xz
Package openjdk7: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-7-earmv6hf-20150306.tar.xz
Package openjdk7: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-7-sparc64-20150301.tar.xz
Package openjdk7: missing distfile openjdk7/bootstrap-jdk7u60-bin-dragonfly-3.8-amd64-20140719.tar.bz2
Package openjdk8: missing distfile openjdk7/bootstrap-jdk-1.7.76-freebsd-10-amd64-20150301.tar.xz
Package openjdk8: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-5-i386-20150301.tar.xz
Package openjdk8: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-6-i386-20150301.tar.xz
Package openjdk8: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-7-earmv6hf-20150306.tar.xz
Package openjdk8: missing distfile openjdk7/bootstrap-jdk-1.7.76-netbsd-7-sparc64-20150301.tar.xz
Package openjdk8: missing distfile openjdk7/bootstrap-jdk7u60-bin-dragonfly-3.8-amd64-20140719.tar.bz2
Package oracle-jdk8: missing distfile jdk-8u60-linux-i586.tar.gz
Package oracle-jdk8: missing distfile jdk-8u60-solaris-x64.tar.gz
Package oracle-jre8: missing distfile jre-8u60-linux-i586.tar.gz
Package oracle-jre8: missing distfile jre-8u60-solaris-x64.tar.gz
Package sun-jdk6: missing distfile jdk-6u45-linux-i586.bin
Package sun-jdk6: missing distfile jdk-6u45-solaris-i586.sh
Package sun-jdk7: missing distfile jdk-7u72-linux-i586.tar.gz
Package sun-jdk7: missing distfile jdk-7u72-solaris-i586.tar.gz
Package sun-jre6: missing distfile jce_policy-6.zip
Package sun-jre6: missing distfile jre-6u45-linux-x64.bin
Package sun-jre6: missing distfile jre-6u45-solaris-x64.sh
Package sun-jre7: missing distfile jre-7u72-linux-i586.tar.gz
Package sun-jre7: missing distfile jre-7u72-solaris-i586.tar.gz
Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden). All existing
SHA1 digests retained for now as an audit trail.
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settings of INSTALL_UNSTRIPPED=yes for Darwin in individual packages.
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from bugfixes):
- Coq compilation made possible with forthcoming ocaml 4.03.
- command for locating exists notation in refman changed.
- Various improvements of the Reference Manual (especially its html version)
- implicit arguments of local definitions fixed (possible
source of incompatibilities).
- New command "Print Debug GC".
- Function cannot define graph.
- Optimizing compilation of pattern matching.
- Better inference of impossible cases in pattern-matching.
- Evar leak in pattern-matching compilation
- ill-typed replacement in "change ... with ...".
- unbound evars in "change ... with ...".
- wrong return clause of a match pattern in Ltac.
- cleared local hints for autounfold.
- cleared local hints for autounfold.
- lost evars in "change ... with ...".
- supporting let-ins in constructors for vm_compute
- unfortunate typo in compare_height.
- unfortunate typos in absorption lemmas over bool.
- Full support of utf8 Greek letters (block U0370) in coqdoc
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repository upstream) and updated package to use ocaml.mk framework.
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Changes from V8.4pl3 to V8.4pl4
===============================
WARNING:
The current logic of Coq is now known to be inconsistent with
Axiom prop_extensionality : forall A B:Prop, (A <-> B) -> A = B.
For more details, see:
https://gforge.inria.fr/plugins/scmgit/cgi-bin/gitweb.cgi?p=coq/coq.git;a=blob_plain;f=test-suite/failure/subterm2.v;hb=HEAD
or
https://gforge.inria.fr/plugins/scmgit/cgi-bin/gitweb.cgi?p=coq/coq.git;a=blob_plain;f=test-suite/failure/subterm3.v;hb=HEAD
Kernel
- Unsound check of elimination sort.
- Fix guard condition for nested cofixpoints.
- Univ constraints of module subtyping were not propagated.
Tactics
- A new option "Set Stable Omega" ensures that repeated identical calls
to omega will produce identical proof terms. This option is off by default
for maximal compatibility, but should be pretty safe to activate.
- The interpretation of the open_constr tactic argument was erroneously
firing type classes resolution in some corner cases. This has been
fixed. The tactic argument type open_constr_wTC is provided for retro
compatibility purposes.
- Fixing bug (fixing precedence of ltac variables over variables in
env) introduces rare and justified tactic failure.
Bug fixes
- micromega: solved an ambiguous symbol resolution.
- Coq always uses / as separator between directories on all platforms.
- remove trailing '\r' from file names returned by coqtop.
- bug correction in proving inversion principles for Function.
- ocamlbuild: minor fixes related to camlp4 and cross-compilation.
Changes from V8.4pl2 to V8.4pl3
===============================
Ide_slave XML interface
- 20120712, 20130419 : Invalidated protocol versions
- From 20130419 extra datastructure : union
(Inl "" = <union val="in_l"><string></string></union>,
Inr _ = <union val="in_r">...)
- 20130419~1 : new toplevel entry : message, not send by coptop v8.4 and not
handle by coqide v8.4. A message has a level and a content (of string).
Message levels are Debug of string, Info, Notice, Warning and Error.
- 20130425 :
* new toplevel entry : feedback, once again not send by coqtop v8.4 and not
handle by coqide v8.4. A feedback gives the id of the sentence it provides info
about and a content. Feedback contents are Processed, AddedAxiom and
GlobRef of Util.loc * string * string * string * string
* <call val="interp"> must provide an attribute id of type int. It is OK in
coqtop v8.4 to alwais send <call val="interp" id="0">
Bug fixes
- Fixing a significant efficiency leak in the code of the field tactic.
- Fix caching of local hint database in typeclasses eauto which could
miss some hypotheses.
- Fix automatic solving of obligation in program, which was not trying
to solve obligations that had no undefined dependencies left.
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Fix PR pkg/48777
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The latter has been deprecated in TeX Live 2013.
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NetBSD 6, requested by tron.
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Recursively bump package revisions again after the "freetype2" and
"fontconfig" handling was fixed.
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to address issues with NetBSD-6(and earlier)'s fontconfig not being
new enough for pango.
While doing that, also bump freetype2 dependency to current pkgsrc
version.
Suggested by tron in PR 47882
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Bug fixes
- Solved bugs :
#2466 #2629 #2668 #2750 #2839 #2869 #2954 #2955 #2959 #2962 #2966 #2967
#2969 #2970 #2975 #2976 #2977 #2978 #2981 #2983 #2995 #3000 #3004 #3008
- Partially fixed bugs : #2830 #2949
- Coqtop should now react more reliably when receiving interrupt signals:
all the "try...with" constructs have been protected against undue
handling of the Sys.Break exception.
Coqide
- The Windows-specific code handling the interrupt button of Coqide
had to be reworked (cf. bug #2869). Now, in Win32 this button does
not target a specific coqtop client, but instead sends a Ctrl-C to
any process sharing its console with Coqide. To avoid awkward
effects, it is recommended to launch Coqide via its icon, its menu,
or in a dedicated console window.
Extraction
- The option Extraction AccessOpaque is now set by default,
restoring compatibility of older versions of Coq (cf bug #2952).
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