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.
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
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
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.
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
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).
Bug fixes
- Solved bugs :
#2851#2863#2865#2893#2895#2892#2905#2906#2907#2917#2921#2930#2941#2878
- Partially fixed bug : #2904
- Various fixes concerning coq_makefile
Optimizations
- "Union by rank" optimization for universes contributed by J.H. Jourdan
and G. Sherrer (see union-find-and-coq-universes on gagallium blog).
Libraries
- Internal organisation of some modular libraries have slightly changed
due to bug #2904 (GenericMinMax, OrdersTac)
- No more constant "int" in ZArith/Int.v to avoid name clash with OCaml
(cf bug #2878).
Coqide
- Improved shutdown of coqtop processes spawned by coqide
(in particular added a missing close_on_exec primitive before forking).
- On windows, launching coqide with the -debug option now produces
a log file in the user's temporary directory. The location of this
log file is displayed in the "About" message.
richards@cs.princeton.edu). Updated package to use PLIST_VARS and CONF_FILES.
Updated coq to version 8.4. Changes include:
Logic
- Standard eta-conversion now supported (dependent product only).
- Guard condition improvement: subterm property is propagated through beta-redex
blocked by pattern-matching, as in "(match v with C .. => fun x => u end) x";
this allows for instance to use "rewrite ... in ..." without breaking
the guard condition.
Vernacular commands
- The "Reset" command is now supported again in files given to coqc or Load.
- "Show Script" now indents again the displayed scripts. It can also work
correctly across Load'ed files if the option "Unset Atomic Load" is used.
- "Open Scope" can now be given the delimiter (e.g. Z) instead of the full
scope name (e.g. Z_scope).
- Commands "Back" and "BackTo" are now handling the proof states. They may
perform some extra steps of backtrack to avoid states where the proof
state is unavailable (typically a closed proof).
- The commands "Suspend" and "Resume" have been removed.
- A basic Show Script has been reintroduced (no indentation).
- New command "Set Parsing Explicit" for deactivating parsing (and printing)
of implicit arguments (useful for teaching).
- New command "Grab Existential Variables" to transform the unresolved evars
at the end of a proof into goals.
- It is now mandatory to have a space (or tabulation or newline or end-of-file)
after a "." ending a sentence.
- In SearchAbout, the [ ] delimiters are now optional.
- New command "Add/Remove Search Blacklist <substring> ...":
a Search or SearchAbout or similar query will never mention lemmas
whose qualified names contain any of the declared substrings.
The default blacklisted substrings are "_admitted" "_subproof" "Private_".
- When the output file of "Print Universes" ends in ".dot" or ".gv",
the universe graph is printed in the DOT language, and can be
processed by Graphviz tools.
- New command "Print Sorted Universes".
- The undocumented and obsolete option "Set/Unset Boxed Definitions" has
been removed, as well as syntaxes like "Boxed Fixpoint foo".
- A new option "Set Default Timeout n / Unset Default Timeout".
- Qed now uses information from the reduction tactics used in proof script
to avoid conversion at Qed time to go into a very long computation.
- New command "Show Goal ident" to display the statement of a goal, even
a closed one (available from Proof General).
- Command "Proof" accept a new modifier "using" to force generalization
over a given list of section variables at section ending.
- New command "Arguments" generalizing "Implicit Arguments" and
"Arguments Scope" and that also allows to rename the parameters of a
definition and to tune the behavior of the tactic "simpl".
Specification language and Notations
- Most compatibility notations of the standard library are now tagged as
(compat xyz), where xyz is a former Coq version, for instance "8.3".
These notations behave as (only parsing) notations, except that they may
triggers warnings (or errors) when used while Coq is not in a corresponding
-compat mode.
- To activate these compatibility warnings, use "Set Verbose Compat Notations"
or the command-line flag -verbose-compat-notations.
- For a strict mode without these compatibility notations, use
"Unset Compat Notations" or the command-line flag -no-compat-notations.
- Maximal implicit arguments can now be set locally by { }. The registration
traverses fixpoints and lambdas. Because there is conversion in types,
maximal implicit arguments are not taken into account in partial
applications (use eta expanded form with explicit { } instead).
- Added support for recursive notations with binders (allows for instance
to write "exists x y z, P").
- Structure/Record printing can be disable by "Unset Printing Records".
In addition, it can be controlled on type by type basis using
"Add Printing Record" or "Add Printing Constructor".
- Pattern-matching compilation algorithm: in "match x, y with ... end",
possible dependencies of x (or of the indices of its type) in the type
of y are now taken into account.
Tactics
- An annotation "eqn:H" or "eqn:?" can be added to a "destruct"
or "induction" to make it generate equations in the spirit of "case_eq".
The former syntax "_eqn" is discontinued.
- The name of the hypothesis introduced by tactic "remember" can be
set via the new syntax "remember t as x eqn:H" (wish #2489).
- Still no general "info" tactical, but new specific tactics info_auto,
info_eauto, info_trivial which provides information on the proofs found
by auto/eauto/trivial. Display of these details could also be activated by
"Set Info Auto"/"Set Info Eauto"/"Set Info Trivial".
- Details on everything tried by auto/eauto/trivial during a proof search
could be obtained by "debug auto", "debug eauto", "debug trivial" or by a
global "Set Debug Auto"/"Set Debug Eauto"/"Set Debug Trivial".
- New command "r string" in Ltac debugger that interprets "idtac
string" in Ltac code as a breakpoint and jumps to its next use.
- Tactics from the Dp plugin (simplify, ergo, yices, cvc3, z3, cvcl,
harvey, zenon, gwhy) have been removed, since Why2 has not been
maintained for the last few years. The Why3 plugin should be a suitable
replacement in most cases.
- New proof engine.
- Scripts can now be structured thanks to bullets - * + and to subgoal
delimitation via { }. Note: for use with Proof General, a cvs version of
Proof General no older than mid-July 2011 is currently required.
- Support for tactical "info" is suspended.
- Support for command "Show Script" is suspended.
- New tactics constr_eq, is_evar and has_evar for use in Ltac.
- Removed the two-argument variant of "decide equality".
- New experimental tactical "timeout <n> <tac>". Since <n> is a time
in second for the moment, this feature should rather be avoided
in scripts meant to be machine-independent.
- Fix in "destruct": removal of unexpected local definitions in context might
result in some rare incompatibilities (solvable by adapting name hypotheses).
- Introduction pattern "_" made more robust.
- Tactic (and Eval command) vm_compute can now be interrupted via Ctrl-C.
- Unification in "apply" supports unification of patterns of the form
?f x y = g(x,y) (compatibility ensured by using
"Unset Tactic Pattern Unification"). It also supports (full) betaiota.
- Tactic autorewrite does no longer instantiate pre-existing
existential variables (theoretical source of possible incompatibilities).
- Tactic "dependent rewrite" now supports equality in "sig".
- Tactic omega now understands Zpred (wish #1912) and can prove any goal
from a context containing an arithmetical contradiction (wish #2236).
- Using "auto with nocore" disables the use of the "core" database (wish #2188).
This pseudo-database "nocore" can also be used with trivial and eauto.
- Tactics "set", "destruct" and "induction" accepts incomplete terms and
use the goal to complete the pattern assuming it is non ambiguous.
- When used on arguments with a dependent type, tactics such as
"destruct", "induction", "case", "elim", etc. now try to abstract
automatically the dependencies over the arguments of the types
(based on initial ideas from Chung-Kil Hur, extension to nested
dependencies suggested by Dan Grayson)
- Tactic "injection" now failing on an equality showing no constructors while
it was formerly generalizing again the goal over the given equality.
- In Ltac, the "context [...]" syntax has now a variant "appcontext [...]"
allowing to match partial applications in larger applications.
- When applying destruct or inversion on a fixpoint hiding an inductive
type, recursive calls to the fixpoint now remain folded by default (rare
source of incompatibility generally solvable by adding a call to simpl).
- In an ltac pattern containing a "match", a final "| _ => _" branch could be
used now instead of enumerating all remaining constructors. Moreover, the
pattern "match _ with _ => _ end" now allows to match any "match". A "in"
annotation can also be added to restrict to a precise inductive type.
- The behavior of "simpl" can be tuned using the "Arguments" vernacular.
In particular constants can be marked so that they are always/never unfolded
by "simpl", or unfolded only when a set of arguments evaluates to a
constructor. Last one can mark a constant so that it is unfolded only if the
simplified term does not expose a match in head position.
Libraries
- Reals: changed definition of PI, no more axiom about sin(PI/2).
- SetoidPermutation: a notion of permutation for lists modulo a setoid equality.
- BigN: fixed the ocaml code doing the parsing/printing of big numbers.
- MSetRBT: a new implementation of MSets via Red-Black trees (initial
contribution by Andrew Appel).
- MSetAVL: for maximal sharing with the new MSetRBT, the argument order
of Node has changed (this should be transparent to regular MSets users).
- Extension of the abstract part of Numbers, which now provide axiomatizations
and results about many more integer functions, such as pow, gcd, lcm, sqrt,
log2 and bitwise functions. These functions are implemented for nat, N, BigN,
Z, BigZ. See in particular file NPeano for new functions about nat.
- The definition of types positive, N, Z is now in file BinNums.v
- Major reorganization of ZArith. The initial file ZArith/BinInt.v now contains
an internal module Z implementing the Numbers interface for integers.
This module Z regroups:
* all functions over type Z : Z.add, Z.mul, ...
* the minimal proofs of specifications for these functions : Z.add_0_l, ...
* an instantation of all derived properties proved generically in Numbers :
Z.add_comm, Z.add_assoc, ...
A large part of ZArith is now simply compatibility notations, for instance
Zplus_comm is an alias for Z.add_comm. The direct use of module Z is now
recommended instead of relying on these compatibility notations.
- Similar major reorganization of NArith, via a module N in NArith/BinNat.v
- Concerning the positive datatype, BinPos.v is now in a specific directory
PArith, and contains an internal submodule Pos. We regroup there functions
such as Pos.add Pos.mul etc as well as many results about them. These results
are here proved directly (no Number interface for strictly positive numbers).
- Note that in spite of the compatibility layers, all these reorganizations
may induce some marginal incompatibilies in scripts. In particular:
* the "?=" notation for positive now refers to a binary function Pos.compare,
instead of the infamous ternary Pcompare (now Pos.compare_cont).
* some hypothesis names generated by the system may changed (typically for
a "destruct Z_le_gt_dec") since naming is done after the short name of
the head predicate (here now "le" in module Z instead of "Zle", etc).
* the internals of Z.add has changed, now relying of Z.pos_sub.
- Also note these new notations:
* "<?" "<=?" "=?" for boolean tests such as Z.ltb Z.leb Z.eqb.
* "÷" for the alternative integer division Z.quot implementing the Truncate
convention (former ZOdiv), while the notation for the Coq usual division
Z.div implementing the Flooring convention remains "/". Their corresponding
modulo functions are Z.rem (no notations) for Z.quot and Z.modulo (infix
"mod" notation) for Z.div.
- Lemmas about conversions between these datatypes are also organized
in modules, see for instance modules Z2Nat, N2Z, etc.
- When creating BigN, the macro-generated part NMake_gen is much smaller.
The generic part NMake has been reworked and improved. Some changes
may introduce incompatibilities. In particular, the order of the arguments
for BigN.shiftl and BigN.shiftr is now reversed: the number to shift now
comes first. By default, the power function now takes two BigN.
- Creation of Vector, an independent library for lists indexed by their length.
Vectors' names overwrite lists' one so you should not "Import" the library.
All old names changed: function names follow the ocaml ones and, for example,
Vcons becomes Vector.cons. You can get [..;..;..]-style notations by importing
Vector.VectorNotations.
- Removal of TheoryList. Requiring List instead should work most of the time.
- New syntax "rew Heq in H" and "rew <- Heq in H" for eq_rect and
eq_rect_r (available by importing module EqNotations).
- Wf.iter_nat is now Peano.nat_iter (with an implicit type argument).
Module System
- The names of modules (and module types) are now in a fully separated
namespace from ordinary definitions: "Definition E:=0. Module E. End E."
is now accepted.
- During subtyping checks, an opaque constant in a module type could now
be implemented by anything of the right type, even if bodies differ.
Said otherwise, with respect to subtyping, an opaque constant behaves
just as a parameter. Coqchk was already implementing this, but not coqtop.
- The inlining done during application of functors can now be controlled
more precisely, by the annotations (no inline) or (inline at level XX).
With the latter annotation, only functor parameters whose levels
are lower or equal than XX will be inlined.
The level of a parameter can be fixed by "Parameter Inline(30) foo".
When levels aren't given, the default value is 100. One can also use
the flag "Set Inline Level ..." to set a level.
- Print Assumptions should now handle correctly opaque modules (#2168).
- Print Module (Type) now tries to print more details, such as types and
bodies of the module elements. Note that Print Module Type could be
used on a module to display only its interface. The option
"Set Short Module Printing" could be used to switch back to the earlier
behavior were only field names were displayed.
CoqIDE
- Coqide now supports the "Restart" command, and "Undo" (with a warning).
Better support for "Abort".
- Coqide now runs coqtop as separated process, making it more robust:
coqtop subprocess can be interrupted, or even killed and relaunched
(cf button "Restart Coq", ex-"Go to Start"). For allowing such
interrupts, the Windows version of coqide now requires Windows >= XP
SP1.
- The communication between CoqIDE and Coqtop is now done via a dialect of XML.
- The backtrack engine of CoqIDE has been reworked, it now uses the
"Backtrack" command similarly to Proof General.
- The Coqide parsing of sentences has be reworked and now supports
tactic delimitation via { }.
- Coqide now accepts the Abort command (wish #2357).
- Coqide can read coq_makefile files as "project file" and use it to
set automatically options to send to coqtop.
- Preference files have moved to $XDG_CONFIG_HOME/coq and accelerators
are not stored as a list anymore.
Internal infrastructure
- Opaque proofs are now loaded lazily by default. This allows to be almost as
fast as -dont-load-proofs, while being safer (no creation of axioms) and
avoiding feature restrictions (Print and Print Assumptions work ok).
- Revised hash-consing code allowing more sharing of memory
- Experimental support added for camlp4 (the one provided alongside ocaml),
simply pass option -usecamlp4 to ./configure. By default camlp5 is used.
- Revised build system: no more stages in Makefile thanks to some recursive
aspect of recent gnu make, use of vo.itarget files containing .v to compile
for both make and ocamlbuild, etc.
- Support of cross-compilation via mingw from unix toward Windows,
contact P. Letouzey for more informations.
- New Makefile rules mli-doc to make html of mli in dev/doc/html and
full-stdlib to get a (huge) pdf reflecting the whole standard library.
Extraction
- By default, opaque terms are now truly considered opaque by extraction:
instead of accessing their body, they are now considered as axioms.
The previous behaviour can be reactivated via the option
"Set Extraction AccessOpaque".
- The pretty-printer for Haskell now produces layout-independant code
- A new command "Separate Extraction cst1 cst2 ..." that mixes a
minimal extracted environment a la "Recursive Extraction" and the
production of several files (one per coq source) a la "Extraction Library".
- New option "Set/Unset Extraction KeepSingleton" for preventing the
extraction to optimize singleton container types.
- The extraction now identifies and properly rejects a particular case of
universe polymorphism it cannot handle yet (the pair (I,I) being Prop).
- Support of anonymous fields in record (#2555).
Tools
- Coq now searches directories specified in COQPATH, $XDG_DATA_HOME/coq,
$XDG_DATA_DIRS/coq, and user-contribs before the standard library.
- Coq rc file has moved to $XDG_CONFIG_HOME/coq.
- Major changes to coq_makefile:
* mli/mlpack/mllib taken into account, ml not preproccessed anymore, ml4 work;
* mlihtml generates doc of mli, install-doc install the html doc in DOCDIR
with the same policy as vo in COQLIB;
* More variables are given by coqtop -config, others are defined only if the
users doesn't have defined them elsewhere. Consequently, generated makefile
should work directly on any architecture;
* Packagers can take advantage of $(DSTROOT) introduction. Installation can
be made in $XDG_DATA_HOME/coq;
* -arg option allows to send option as argument to coqc.
