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Changes from 8.8.2 to 8.9+beta1
===============================
Tactics
- Added toplevel goal selector ! which expects a single focused goal.
Use with Set Default Goal Selector to force focusing before tactics
are called.
- The undocumented "nameless" forms `fix N`, `cofix` that were
deprecated in 8.8 have been removed from LTAC's syntax; please use
`fix ident N/cofix ident` to explicitely name the (co)fixpoint
hypothesis to be introduced.
- Introduction tactics "intro"/"intros" on a goal which is an
existential variable now force a refinement of the goal into a
dependent product rather than failing.
- Support for fix/cofix added in Ltac "match" and "lazymatch".
- Ltac backtraces now include trace information about tactics
called by OCaml-defined tactics.
- Option "Ltac Debug" now applies also to terms built using Ltac functions.
- Deprecated the Implicit Tactic family of commands.
- The `simple apply` tactic now respects the `Opaque` flag when called from
Ltac (`auto` still does not respect it).
Tools
- Coq_makefile lets one override or extend the following variables from
the command line: COQFLAGS, COQCHKFLAGS, COQDOCFLAGS.
COQFLAGS is now entirely separate from COQLIBS, so in custom Makefiles
$(COQFLAGS) should be replaced by $(COQFLAGS) $(COQLIBS).
Vernacular Commands
- Removed deprecated commands Arguments Scope and Implicit Arguments
(not the option). Use the Arguments command instead.
- Nested proofs may be enabled through the option `Nested Proofs Allowed`.
By default, they are disabled and produce an error. The deprecation
warning which used to occur when using nested proofs has been removed.
Coq binaries and process model
- Before 8.9, Coq distributed a single `coqtop` binary and a set of
dynamically loadable plugins that used to take over the main loop
for tasks such as IDE language server or parallel proof checking.
These plugins have been turned into full-fledged binaries so each
different process has associated a particular binary now, in
particular `coqidetop` is the CoqIDE language server, and
`coq{proof,tactic,query}worker` are in charge of task-specific and
parallel proof checking.
Changes from 8.8.0 to 8.8.1
===========================
Kernel
- Fix a critical bug with cofixpoints and vm_compute/native_compute (#7333).
- Fix a critical bug with inlining of polymorphic constants (#7615).
Notations
- Fixed unexpected collision between only-parsing and only-printing
notations (issue #7462).
Changes from 8.8+beta1 to 8.8.0
===============================
Tools
- Asynchronous proof delegation policy was fixed. Since version 8.7
Coq was ignoring previous runs and the -async-proofs-delegation-threshold
option did not have the expected behavior.
Tactic language
- The undocumented "nameless" forms `fix N`, `cofix` have been
deprecated; please use `fix ident N /cofix ident` to explicitely
name the (co)fixpoint hypothesis to be introduced.
Documentation
- The reference manual is now fully ported to Sphinx.
Other small deprecations and bug fixes.
Changes from 8.7.2 to 8.8+beta1
===============================
Kernel
- Support for template polymorphism for definitions was removed. May trigger
more "universe inconsistency" errors in rare occasions.
- Fixpoints are no longer allowed on non-recursive inductive types.
Notations
- Recursive notations with the recursive pattern repeating on the
right (e.g. "( x ; .. ; y ; z )") now supported.
- Notations with a specific level for the leftmost nonterminal,
when printing-only, are supported.
- Notations can now refer to the syntactic category of patterns (as in
"fun 'pat =>" or "match p with pat => ... end"). Two variants are
available, depending on whether a single variable is considered as a
pattern or not.
- Recursive notations now support ".." patterns with several
occurrences of the recursive term or binder, possibly mixing terms
and binders, possibly in reverse left-to-right order.
- "Locate" now working also on notations of the form "x + y" (rather
than "_ + _").
Specification language
- When printing clauses of a "match", clauses with same right-hand
side are factorized and the last most factorized clause with no
variables, if it exists, is turned into a default clause.
Use "Unset Printing Allow Default Clause" do deactivate printing
of a default clause.
Use "Unset Printing Factorizable Match Patterns" to deactivate
factorization of clauses with same right-hand side.
Tactics
- On Linux, "native_compute" calls can be profiled using the "perf"
utility. The command "Set NativeCompute Profiling" enables
profiling, and "Set NativeCompute Profile Filename" customizes
the profile filename.
- The tactic "omega" is now aware of the bodies of context variables
such as "x := 5 : Z" (see #1362). This could be disabled via
Unset Omega UseLocalDefs.
- The tactic "romega" is also aware now of the bodies of context variables.
- The tactic "zify" resp. "omega with N" is now aware of N.pred.
- Tactic "decide equality" now able to manage constructors which
contain proofs.
- Added tactics reset ltac profile, show ltac profile (and variants)
- Added tactics restart_timer, finish_timing, and time_constr as an
experimental way of timing Ltac's evaluation phase
- Added tactic optimize_heap, analogous to the Vernacular Optimize
Heap, which performs a major garbage collection and heap compaction
in the OCaml run-time system.
- The tactics "dtauto", "dintuition", "firstorder" now handle inductive types
with let bindings in the parameters.
- The tactic "dtauto" now handles some inductives such as
"@sigT A (fun _ => B)" as non-dependent conjunctions.
- A bug fixed in "rewrite H in *" and "rewrite H in * |-" may cause a
few rare incompatibilities (it was unintendedly recursively
rewriting in the side conditions generated by H).
- Added tactics "assert_succeeds tac" and "assert_fails tac" to ensure
properties of the executation of a tactic without keeping the effect
of the execution.
- `vm_compute` now supports existential variables.
- Calls to `shelve` and `give_up` within calls to tactic `refine` now working.
- Deprecated tactic `appcontext` was removed.
Focusing
- Focusing bracket `{` now supports single-numbered goal selector,
e.g. `2: {` will focus on the second sub-goal. As usual, unfocus
with `}` once the sub-goal is fully solved.
The `Focus` and `Unfocus` commands are now deprecated.
Vernacular Commands
- Proofs ending in "Qed exporting ident, .., ident" are not supported
anymore. Constants generated during `abstract` are kept private to the
local environment.
- The deprecated Coercion Local, Open Local Scope, Notation Local syntax
was removed. Use Local as a prefix instead.
- For the Extraction Language command, "OCaml" is spelled correctly.
The older "Ocaml" is still accepted, but deprecated.
- Using “Require” inside a section is deprecated.
- An experimental command "Show Extraction" allows to extract the content
of the current ongoing proof (grant wish #4129).
- Coercion now accepts the type of its argument to be "Prop" or "Type".
- The "Export" modifier can now be used when setting and unsetting options, and
will result in performing the same change when the module corresponding the
command is imported.
- The `Axiom` command does not automatically declare axioms as instances when
their type is a class. Previous behavior can be restored using `Set
Typeclasses Axioms Are Instances`.
Universes
- Qualified naming of global universes now works like other namespaced
objects (e.g. constants), with a separate namespace, inside and across
module and library boundaries. Global universe names introduced in an
inductive / constant / Let declaration get qualified with the name of
the declaration.
- Universe cumulativity for inductive types is now specified as a
variance for each polymorphic universe. See the reference manual for
more information.
- Inference of universe constraints with cumulative inductive types
produces more general constraints. Unsetting new option Cumulativity
Weak Constraints produces even more general constraints (but may
produce too many universes to be practical).
- Fix #5726: Notations that start with `Type` now support universe instances
with `@{u}`.
- `with Definition` now understands universe declarations
(like `@{u| Set < u}`).
Tools
- Coq can now be run with the option -mangle-names to change the auto-generated
name scheme. This is intended to function as a linter for developments that
want to be robust to changes in auto-generated names. This feature is experimental,
and may change or disappear without warning.
- GeoProof support was removed.
Checker
- The checker now accepts filenames in addition to logical paths.
CoqIDE
- Find and Replace All report the number of occurrences found; Find indicates
when it wraps.
coqdep
- Learned to read -I, -Q, -R and filenames from _CoqProject files.
This is used by coq_makefile when generating dependencies for .v
files (but not other files).
Documentation
- The Coq FAQ, formerly located at https://coq.inria.fr/faq, has been
moved to the GitHub wiki section of this repository; the main entry
page is https://github.com/coq/coq/wiki/The-Coq-FAQ.
- Documentation: a large community effort resulted in the migration
of the reference manual to the Sphinx documentation tool. The result
is partially integrated in this version.
Standard Library
- New libraries Coq.Init.Decimal, Coq.Numbers.DecimalFacts,
Coq.Numbers.DecimalNat, Coq.Numbers.DecimalPos,
Coq.Numbers.DecimalN, Coq.Numbers.DecimalZ,
Coq.Numbers.DecimalString providing a type of decimal numbers, some
facts about them, and conversions between decimal numbers and nat,
positive, N, Z, and string.
- Added [Coq.Strings.String.concat] to concatenate a list of strings
inserting a separator between each item
- Notation `'` for Zpos in QArith was removed.
- Some deprecated aliases are now emitting warnings when used.
Compatibility support
- Support for compatibility with versions before 8.6 was dropped.
Options
- The following deprecated options have been removed:
+ `Refolding Reduction`
+ `Standard Proposition Elimination`
+ `Dependent Propositions Elimination`
+ `Discriminate Introduction`
+ `Shrink Abstract`
+ `Tactic Pattern Unification`
+ `Intuition Iff Unfolding`
+ `Injection L2R Pattern Order`
+ `Record Elimination Schemes`
+ `Match Strict`
+ `Tactic Compat Context`
+ `Typeclasses Legacy Resolution`
+ `Typeclasses Module Eta`
+ `Typeclass Resolution After Apply`
Changes from 8.7.1 to 8.7.2
===========================
Fixed a critical bug in the VM handling of universes (#6677). This bug
affected all releases since 8.5.
Improved support for building with OCaml 4.06.0 and external num package.
Many other bug fixes, documentation improvements, and user
message improvements (for details, see the 8.7.2 milestone at
https://github.com/coq/coq/milestone/11?closed=1).
Changes from 8.7.0 to 8.7.1
===========================
Compatibility with OCaml 4.06.0.
Many bug fixes, documentation improvements, and user message improvements (for
details see the 8.7.1 milestone at https://github.com/coq/coq/milestone/10?closed=1).
Changes from 8.7+beta2 to 8.7.0
===============================
OCaml
- Users can pass specific flags to the OCaml optimizing compiler by
-using the flambda-opts configure-time option.
Beware that compiling Coq with a flambda-enabled compiler is
experimental and may require large amounts of RAM and CPU, see
INSTALL for more details.
Changes from 8.7+beta1 to 8.7+beta2
===================================
Tools
- In CoqIDE, the "Compile Buffer" command takes account of flags in
_CoqProject or other project file.
Improvements around some error messages.
Many bug fixes including two important ones:
- Bug #5730: CoqIDE becomes unresponsive on file open.
- coq_makefile: make sure compile flags for Coq and coq_makefile are in sync
(in particular, make sure the `-safe-string` option is used to compile plugins).
Changes from 8.6.1 to 8.7+beta1
===============================
Tactics
- New tactic "extensionality in H" which applies (possibly dependent)
functional extensionality in H supposed to be a quantified equality
until giving a bare equality.
- New tactic "inversion_sigma" which turns equalities of dependent
pairs (e.g., "existT P x p = existT P y q", frequently left over by
"inversion" on a dependent type family) into pairs of equalities
(e.g., a hypothesis "H : x = y" and a hypothesis of type "rew H in p
= q"); these hypotheses can subsequently be simplified using
"subst", without ever invoking any kind of axiom asserting
uniqueness of identity proofs. If you want to explicitly specify the
hypothesis to be inverted, or name the generated hypotheses, you can
invoke "induction H as [H1 H2] using eq_sigT_rect". The tactic also
works for "sig", "sigT2", and "sig2", and there are similar
"eq_sig*_rect" induction lemmas.
- Tactic "specialize with ..." now accepts any partial bindings.
Missing bindings are either solved by unification or left quantified
in the hypothesis.
- New representation of terms that statically ensure stability by
evar-expansion. This has several consequences.
* In terms of performance, this adds a cost to every term destructuration,
but at the same time most eager evar normalizations were removed, which
couterbalances this drawback and even sometimes outperforms the old
implementation. For instance, many operations that would require O(n)
normalization of the term are now O(1) in tactics. YMMV.
* This triggers small changes in unification, which was not evar-insensitive.
Most notably, the new implementation recognizes Miller patterns that were
missed before because of a missing normalization step. Hopefully this should
be fairly uncommon.
- Tactic "auto with real" can now discharge comparisons of literals.
- The types of variables in patterns of "match" are now
beta-iota-reduced after type-checking. This has an impact on the
type of the variables that the tactic "refine" introduces in the
context, producing types a priori closer to the expectations.
- In "Tactic Notation" or "TACTIC EXTEND", entry "constr_with_bindings"
now uses type classes and rejects terms with unresolved holes, like
entry "constr" does. To get the former behavior use
"open_constr_with_bindings" (possible source of incompatibility).
- New e-variants eassert, eenough, epose proof, eset, eremember, epose
which behave like the corresponding variants with no "e" but turn
unresolved implicit arguments into existential variables, on the
shelf, rather than failing.
- Tactic injection has become more powerful (closes bug #4890) and its
documentation has been updated.
- New variants of the `first` and `solve` tacticals that do not rely
on parsing rules, meant to define tactic notations.
- Added support for side effects hooks in `cbv`, `cbn` and `simpl`.
The side effects are provided via a plugin:
https://github.com/herbelin/reduction-effects/
- It is now possible to take hint database names as parameters in a
Ltac definition or a Tactic Notation.
- New option `Set Ltac Batch Debug` on top of `Set Ltac Debug` for
non-interactive Ltac debug output.
Gallina
- Now supporting all kinds of binders, including 'pat, in syntax of record fields.
Vernacular Commands
- Goals context can be printed in a more compact way when `Set
Printing Compact Contexts` is activated.
- Unfocused goals can be printed with the `Set Printing Unfocused`
option.
- `Print` now shows the types of let-bindings.
- The compatibility options for printing primitive projections
(`Set Printing Primitive Projection Parameters` and
`Set Printing Primitive Projection Compatibility`) are now off by default.
- Possibility to unset the printing of notations in a more fine grained
fashion than `Unset Printing Notations` is provided without any
user-syntax. The goal is that someone creates a plugin to experiment
such a user-syntax, to be later integrated in Coq when stabilized.
- `About` now tells if a reference is a coercion.
- The deprecated `Save` vernacular and its form `Save Theorem id` to
close proofs have been removed from the syntax. Please use `Qed`.
- `Search` now sorts results by relevance (the relevance metric is a
weighted sum of number of distinct symbols and size of the term).
Standard Library
- New file PropExtensionality.v to explicitly work in the axiomatic
context of propositional extensionality.
- New file SetoidChoice.v axiomatically providing choice over setoids,
and, consequently, choice of representatives in equivalence classes.
Various proof-theoretic characterizations of choice over setoids in
file ChoiceFacts.v.
- New lemmas about iff and about orders on positive and Z.
- New lemmas on powerRZ.
- Strengthened statement of JMeq_eq_dep (closes bug #4912).
- The BigN, BigZ, BigZ libraries are no longer part of the Coq standard
library, they are now provided by a separate repository
https://github.com/coq/bignums
The split has been done just after the Int31 library.
- IZR (Reals) has been changed to produce a compact representation of
integers. As a consequence, IZR is no longer convertible to INR and
lemmas such as INR_IZR_INZ should be used instead.
- Real constants are now represented using IZR rather than R0 and R1;
this might cause rewriting rules to fail to apply to constants.
- Added new notation {x & P} for sigT (without a type for x)
Plugins
- The Ssreflect plugin is now distributed with Coq. Its documentation has
been integrated as a chapter of the reference manual. This chapter is
work in progress so feedback is welcome.
- The mathematical proof language (also known as declarative mode) was removed.
- A new command Extraction TestCompile has been introduced, not meant
for the general user but instead for Coq's test-suite.
- The extraction plugin is no longer loaded by default. It must be
explicitly loaded with [Require Extraction], which is backwards
compatible.
- The functional induction plugin (which provides the [Function]
vernacular) is no longer loaded by default. It must be explicitly
loaded with [Require FunInd], which is backwards compatible.
Dependencies
- Support for camlp4 has been removed.
Tools
- coq_makefile was completely redesigned to improve its maintainability and
the extensibility of generated Makefiles, and to make _CoqProject files
more palatable to IDEs. Overview:
* _CoqProject files contain only Coq specific data (i.e. the list of
files, -R options, ...)
* coq_makefile translates _CoqProject to Makefile.conf and copies in the
desired location a standard Makefile (that reads Makefile.conf)
* Makefile extensions can be implemented in a Makefile.local file (read
by the main Makefile) by installing a hook in the extension points
provided by the standard Makefile
The current version contains code for retro compatibility that prints
warnings when a deprecated feature is used. Please upgrade your _CoqProject
accordingly.
* Additionally, coq_makefile-made Makefiles now support experimental timing
targets `pretty-timed`, `pretty-timed-before`, `pretty-timed-after`,
`print-pretty-timed-diff`, `print-pretty-single-time-diff`,
`all.timing.diff`, and the variable `TIMING=1` (or `TIMING=before` or
`TIMING=after`); see the documentation for more details.
Build Infrastructure
- Note that 'make world' does not build the bytecode binaries anymore.
For that, you can use 'make byte' (and 'make install-byte' afterwards).
Warning: native and byte compilations should *not* be mixed in the same
instance of 'make -j', otherwise both ocamlc and ocamlopt might race for
access to the same .cmi files. In short, use "make -j && make -j byte"
instead of "make -j world byte".
Universes
- Cumulative inductive types. see prefixes "Cumulative", "NonCumulative"
for inductive definitions and the option "Set Polymorphic Inductive Cumulativity"
in the reference manual.
- New syntax `foo@{_}` to instantiate a polymorphic definition with
anonymous universes (can also be used with `Type`).
XML Protocol and internal changes
See dev/doc/changes.txt
Many bugfixes including #1859, #2884, #3613, #3943, #3994,
#4250, #4709, #4720, #4824, #4844, #4911, #5026, #5233,
#5275, #5315, #5336, #5360, #5390, #5414, #5417, #5420,
#5439, #5449, #5475, #5476, #5482, #5501, #5507, #5520,
#5523, #5524, #5553, #5577, #5578, #5589, #5597, #5598,
#5607, #5618, #5619, #5620, #5641, #5648, #5651, #5671.
Many bugfixes on OS X and Windows (now the test-suite passes on these
platforms too).
Many optimizations.
Many documentation improvements.
Changes from 8.6 to 8.6.1
=========================
- Fix #5380: Default colors for CoqIDE are actually applied.
- Fix plugin warnings
- Document named evars (including Show ident)
- Fix Bug #5574, document function scope
- Adding a test case as requested in bug 5205.
- Fix Bug #5568, no dup notation warnings on repeated module imports
- Fix documentation of Typeclasses eauto :=
- Refactor documentation of records.
- Protecting from warnings while compiling 8.6
- Fixing an inconsistency between configure and configure.ml
- Add test-suite checks for coqchk with constraints
- Fix bug #5019 (looping zify on dependent types)
- Fix bug 5550: "typeclasses eauto with" does not work with section variables.
- Bug 5546, qualify datatype constructors when needed in Show Match
- Bug #5535, test for Show with -emacs
- Fix bug #5486, don't reverse ids in tuples
- Fixing #5522 (anomaly with free vars of pat)
- Fix bug #5526, don't check for nonlinearity in notation if printing only
- Fix bug #5255
- Fix bug #3659: -time should understand multibyte encodings.
- FIx bug #5300: Anomaly: Uncaught exception Not_found" in "Print Assumptions".
- Fix outdated description in RefMan.
- Repairing `Set Rewriting Schemes`
- Fixing #5487 (v8.5 regression on ltac-matching expressions with evars).
- Fix description of command-line arguments for Add (Rec) LoadPath
- Fix bug #5377: @? patterns broken.
- add XML protocol doc
- Fix anomaly when doing [all:Check _.] during a proof.
- Correction of bug #4306
- Fix #5435: [Eval native_compute in] raises anomaly.
- Instances should obey universe binders even when defined by tactics.
- Intern names bound in match patterns
- funind: Ignore missing info for current function
- Do not typecheck twice the type of opaque constants.
- show unused intro pattern warning
- [future] Be eager when "chaining" already resolved future values.
- Opaque side effects
- Fix #5132: coq_makefile generates incorrect install goal
- Run non-tactic comands without resilient_command
- Univs: fix bug #5365, generation of u+k <= v constraints
- make `emit' tail recursive
- Don't require printing-only notation to be productive
- Fix the way setoid_rewrite handles bindings.
- Fix for bug 5244 - set printing width ignored when given enough space
- Fix bug 4969, autoapply was not tagging shelved subgoals correctly
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.
Changes from V8.5 to V8.5pl1
============================
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
Changes from V8.5beta3 to V8.5
==============================
Tools
- Flag "-compat 8.4" now loads Coq.Compat.Coq84. The standard way of
putting Coq in v8.4 compatibility mode is to pass the command line flag
"-compat 8.4". It can be followed by "-require Coq.Compat.AdmitAxiom"
if the 8.4 behavior of admit is needed, in which case it uses an axiom.
Specification language
- Syntax "$(tactic)$" changed to "ltac:(tactic)".
Tactics
- Syntax "destruct !hyp" changed to "destruct (hyp)", and similarly
for induction (rare source of incompatibilities easily solvable by
removing parentheses around "hyp" when not for the purpose of keeping
the hypothesis).
- Syntax "p/c" for on-the-fly application of a lemma c before
introducing along pattern p changed to p%c1..%cn. The feature and
syntax are in experimental stage.
- "Proof using" does not clear unused section variables.
- Tactic "refine" has been changed back to the 8.4 behavior of shelving subgoals
that occur in other subgoals. The "refine" tactic of 8.5beta3 has been
renamed "simple refine"; it does not shelve any subgoal.
- New tactical "unshelve tac" which grab existential variables put on
the tactic shelve by the execution of "tac".
Changes from V8.5beta2 to V8.5beta3
===================================
Vernacular commands
- New command "Redirect" to redirect the output of a command to a file.
- New command "Undelimit Scope" to remove the delimiter of a scope.
- New option "Strict Universe Declaration", set by default. It enforces the
declaration of all polymorphic universes appearing in a definition when
introducing it.
- New command "Show id" to show goal named id.
- Option "Virtual Machine" removed.
Tactics
- New flag "Regular Subst Tactic" which fixes "subst" in situations where
it failed to substitute all substitutable equations or failed to simplify
cycles, or accidentally unfolded local definitions (flag is off by default).
- New flag "Loose Hint Behavior" to handle hints loaded but not imported in a
special way. It accepts three distinct flags:
* "Lax", which is the default one, sets the old behavior, i.e. a non-imported
hint behaves the same as an imported one.
* "Warn" outputs a warning when a non-imported hint is used. Note that this is
an over-approximation, because a hint may be triggered by an eauto run that
will eventually fail and backtrack.
* "Strict" changes the behavior of an unloaded hint to the one of the fail
tactic, allowing to emulate the hopefully future import-scoped hint mechanism.
- New compatibility flag "Universal Lemma Under Conjunction" which
let tactics working under conjunctions apply sublemmas of the form
"forall A, ... -> A".
- New compatibility flag "Bracketing Last Introduction Pattern" which can be
set so that the last disjunctive-conjunctive introduction pattern given to
"intros" automatically complete the introduction of its subcomponents, as the
the disjunctive-conjunctive introduction patterns in non-terminal position
already do.
- New flag "Shrink Abstract" that minimalizes proofs generated by the abstract
tactical w.r.t. variables appearing in the body of the proof.
Program
- The "Shrink Obligations" flag now applies to all obligations, not only those
solved by the automatic tactic.
- Importing Program no longer overrides the "exists" tactic (potential source
of incompatibilities).
- Hints costs are now correctly taken into account (potential source of
incompatibilities).
- Documented the Hint Cut command that allows control of the
proof-search during typeclass resolution (see reference manual).
API
- Some functions from pretyping/typing.ml and their derivatives were potential
source of evarmap leaks, as they dropped their resulting evarmap. The
situation was clarified by renaming them according to a unsafe_* scheme. Their
sound variant is likewise renamed to their old name. The following renamings
were made.
* Typing.type_of -> unsafe_type_of
* Typing.e_type_of -> type_of
* A new e_type_of function that matches the e_ prefix policy
* Tacmach.pf_type_of -> pf_unsafe_type_of
* A new safe pf_type_of function.
All uses of unsafe_* functions should be eventually eliminated.
Tools
- Added an option -w to control the output of coqtop warnings.
- Configure now takes an optional -native-compiler (yes|no) flag replacing
-no-native-compiler. The new flag is set to no by default under Windows.
- Flag -no-native-compiler was removed and became the default for coqc. If
precompilation of files for native conversion test is desired, use
-native-compiler.
- The -compile command-line option now takes the full path of the considered
file, including the ".v" extension, and outputs a warning if such an extension
is lacking.
- The -require and -load-vernac-object command-line options now take a logical
path of a given library rather than a physical path, thus they behave like
Require [Import] path.
- The -vm command-line option has been removed.
Standard Library
- There is now a Coq.Compat.Coq84 library, which sets the various compatibility
options and does a few redefinitions to make Coq behave more like Coq v8.4.
The standard way of putting Coq in v8.4 compatibility mode is to pass the command
line flags "-require Coq.Compat.Coq84 -compat 8.4".
Changes from V8.5beta1 to V8.5beta2
===================================
Logic
- The VM now supports inductive types with up to 8388851 non-constant
constructors and up to 8388607 constant ones.
Specification language
- Syntax "$(tactic)$" changed to "ltac: tactic".
Tactics
- A script using the admit tactic can no longer be concluded by either
Qed or Defined. In the first case, Admitted can be used instead. In
the second case, a subproof should be used.
- The easy tactic and the now tactical now have a more predictable
behavior, but they might now discharge some previously unsolved goals.