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informative exception if some constraints do not unify.
All calls except one used to raise a less informative exception when the
constraints weren't solved.
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- Cleaning and uniformisation in command.ml:
- For better modularity and better visibility, two files got isolated
out of command.ml:
- lemmas.ml is about starting and saving a proof
- indschemes.ml is about declaring inductive schemes
- Decomposition of the functions of command.ml into a functional part
and the imperative part
- Inductive schemes:
- New architecture in ind_tables.ml for registering scheme builders,
and for sharing and generating on demand inductive schemes
- Adding new automatically generated equality schemes (file eqschemes.ml)
- "_congr" for equality types (completing here commit 12273)
- "_rew_forward" (similar to vernac-level eq_rect_r), "_rew_forward_dep",
"_rew_backward" (similar to eq_rect), "_rew_backward_dep" for
rewriting schemes (warning, rew_forward_dep cannot be stated following
the standard Coq pattern for inductive types: "t=u" cannot be the
last argument of the scheme)
- "_case", "_case_nodep", "_case_dep" for case analysis schemes
- Preliminary step towards discriminate and injection working on any
equality-like type (e.g. eq_true)
- Restating JMeq_congr under the canonical form of congruence schemes
- Renamed "Set Equality Scheme" into "Set Equality Schemes"
- Added "Set Rewriting Schemes", "Set Case Analysis Schemes"
- Activation of the automatic generation of boolean equality lemmas
- Partial debug and error messages improvements for the generation of
boolean equality and decidable equality
- Added schemes for making dependent rewrite working (unfortunately with
not a fully satisfactory design - see file eqschemes.ml)
- Some names of ML function made more regular (see dev/doc/changes.txt)
- Incidentally, added a flush to obsolete Local/Global syntax warning
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branch
and remove equations stuff which moves to a separate plugin.
Classes:
- Ability to define classes post-hoc from constants or inductive types.
- Correctly rebuild the hint database associated to local hypotheses when
they are changed by a [Hint Extern] in typeclass resolution.
Tactics and proofs:
- Change [revert] so that it keeps let-ins (but not [generalize]).
- Various improvements to the [generalize_eqs] tactic to make it more robust
and produce the smallest proof terms possible.
Move [specialize_hypothesis] in tactics.ml as it goes hand in hand with
[generalize_eqs].
- A few new general purpose tactics in Program.Tactics like [revert_until]
- Make transitive closure well-foundedness proofs transparent.
- More uniform testing for metas/evars in pretyping/unification.ml
(might introduce a few changes in the contribs).
Program:
- Better sorting of dependencies in obligations.
- Ability to start a Program definition from just a type and no obligations,
automatically adding an obligation for this type.
- In compilation of Program's well-founded definitions, make the functional a
separate definition for easier reasoning.
- Add a hint database for every Program populated by [Hint Unfold]s for
every defined obligation constant.
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traînaient un peu partout dans le code depuis la fusion d'evar_map et
evar_defs. Début du travail d'uniformisation des noms donnés aux
evar_defs à travers le code.
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when it comes to notation declared in scope
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as hints (see wish #2104).
- New type hint_entry for interpreted hint.
- Better centralization of functions dealing with evaluable_global_reference.
- Unfortunately, camlp4 does not factorize rules so that "Hint Resolve" had
uglily to be factorized by hand.
- Typography in RefMan-tac.tex.
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clause resulting in stray notations for e.g. variable named "le")
and 12083 (fixing bug in as clause of apply in) from trunk.
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- The measure can now refer to all the formal arguments
- The recursive calls can make all the arguments vary as well
- Generalized to any relation and measure (new syntax {measure m on R})
This relies on an automatic curryfication transformation, the real
fixpoint combinator is working on a sigma type of the arguments.
Reduces to the previous impl in case only one argument is involved.
The patch also introduces a new flag on implicit arguments that says if
the argument has to be infered (default) or can be turned into a
subgoal/obligation. Comes with a test-suite file.
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par Evd). Ça s'accompagne de quelques autres modifications de
l'interface (certaines fonctions étaient des doublons, ou des
conversions entre evar_map et evar_defs).
J'ai modifié un peu la structure de evd.ml aussi, pour éviter des
fonctions redéfinies deux fois (i.e. définies trois fois !), j'ai
introduit des sous-modules pour les différentes couches.
Il y a à l'heure actuelle une pénalité en performance assez sévère (due
principalement à la nouvelle mouture de Evd.merge, si mon diagnostique
est correct). Mais fera l'objet de plusieurs optimisations dans les
commits à venir.
Un peu plus ennuyeux, la test-suite du mode déclaratif ne passe plus. Un
appel de Decl_proof_instr.mark_as_done visiblement, je suis pour
l'instant incapable de comprendre ce qui cause cette erreur. J'espère
qu'on pourra le déterminer rapidement.
Ce commit est le tout premier commit dans le trunk en rapport avec les
évolution futures de la machine de preuve, en vue en particulier
d'obtenir un "vrai refine".
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comportement est similaire à la 8.1). Les records récursifs peuvent-être
déclarés avec Inductive et CoInductive, avec les effets idoines sur leur
nature.
J'ai fait quelques changements dans VernacInductive pour que tout ceci
fonctionne bien ensemble. Il reste du nettoyage à faire et probablement
des ajustement dans le Printing.
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==========
This big patch is commited here with a HUGE experimental tag on it. It
is probably not a finished job. The aim of committing it now, as
agreed with Hugo, is to get some feedback from potential users to
identify more clearly the directions the implementation could take. So
please feel free to mail me any remarks, bug reports or advices at
<puech@cs.unibo.it>.
Here are the changes induced by it :
For the user
============
* Search tools have been reimplemented to be faster and more
general. Affected are [SearchPattern], [SearchRewrite] and [Search]
(not [SearchAbout] yet). Changes are:
- All of them accept general constructions, and previous syntactical
limitations are abolished. In particular, one can for example
[SearchPattern (nat -> Prop)], which will find [isSucc], but also
[le], [gt] etc.
- Patterns are typed. This means that you cannot search mistyped
expressions anymore. I'm not sure if it's a good or a bad thing
though (especially regarding coercions)...
* New tool to automatically infer (some) Record/Typeclasses instances.
Usage : [Record/Class *Infer* X := ...] flags a record/class as
subject to instance search. There is also an option to
activate/deactivate the search [Set/Unset Autoinstance]. It works
by finding combinations of definitions (actually all kinds of
objects) which forms a record instance, possibly parameterized. It
is activated at two moments:
- A complete search is done when defining a new record, to find all
possible instances that could have been formed with past
definitions. Example:
Require Import List.
Record Infer Monoid A (op:A->A->A) e :=
{ assoc : forall x y z, op x (op y z) = op (op x y) z;
idl : forall x, x = op x e ;
idr : forall x, x = op e x }.
new instance Monoid_autoinstance_1 : (Monoid nat plus 0)
[...]
- At each new declaration (Definition, Axiom, Inductive), a search
is made to find instances involving the new object. Example:
Parameter app_nil_beg : forall A (l:list A), l = nil ++ l.
new instance Build_Monoid_autoinstance_12 :
(forall H : Type, Monoid (list H) app nil) :=
(fun H : Type =>
Build_Monoid (list H) app nil ass_app (app_nil_beg H)
(app_nil_end H))
For the developper
==================
* New yet-to-be-named datastructure in [lib/dnet.ml]. Should do
efficient one-to-many or many-to-one non-linear first-order
filtering, faster than traditional methods like discrimination nets
(so yes, the name of the file should probably be changed).
* Comes with its application to Coq's terms
[pretyping/term_dnet.ml]. Terms are represented so that you can
search for patterns under products as fast as you would do not under
products, and facilities are provided to express other kind of
searches (head of application, under equality, whatever you need
that can be expressed as a pattern)
* A global repository of all objects defined and imported is
maintained [toplevel/libtypes.ml], with all search facilities
described before.
* A certain kind of proof search in [toplevel/autoinstance.ml]. For
the moment it is specialized on finding instances, but it should be
generalizable and reusable (more on this in a few months :-).
The bad news
============
* Compile time should increase by 0 to 15% (depending on the size of
the Requires done). This could be optimized greatly by not
performing substitutions on modules which are not functors I
think. There may also be some inefficiency sources left in my code
though...
* Vo's also gain a little bit of weight (20%). That's inevitable if I
wanted to store the big datastructure of objects, but could also be
optimized some more.
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splay_prod_n, lam_it -> it_mkLambda, splay_lambda -> splay_lam). Added
shortcuts for "fst (decompose_prod t)" and co.
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guessing the binding name by default and making all generalized
variables implicit. At the same time, continue refactoring of
Record/Class/Inductive etc.., getting rid of [VernacRecord]
definitively. The AST is not completely satisfying, but leaning towards
Record/Class as restrictions of inductive (Arnaud, anyone ?).
Now, [Class] declaration bodies are either of the form [meth : type] or
[{ meth : type ; ... }], distinguishing singleton "definitional" classes
and inductive classes based on records. The constructor syntax is
accepted ([meth1 : type1 | meth1 : type2]) but raises an error
immediately, as support for defining a class by a general inductive type
is not there yet (this is a bugfix!).
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slight improving of the printing of record.
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the three cases.
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declaration code to toplevel/record, including support for singleton
classes as definitions. Parsing code also factorized. Arnaud: one more
thing to think about when refactoring the definitions in vernacentries.
Add support for specifying what to do with anonymous variables in
contexts during internalisation (fixes bug #1982), current choice is to
generate a name for typeclass bindings.
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for record fields (using "someproj : sometype where not := constr" syntax). Only one
notation allowed currently and no redeclaration after the record
declaration either (will be done for typeclasses).
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CoInductive stream (A:Type) := { hd : A ; tl : stream A }.
Inductive nelist (A:Type) := { hd : A ; tl : option (nelist A) }.
L'affichage n'est pas encore poli. Il reste à choisir l'exact destin de
la syntaxe qui était apparue dans la 8.2beta pour les records
coinductifs (qui consistait à utiliser "Record" au lieu de "CoInductive"
comme maintenant).
VernacRecord et VernacInductive semblent maintenant faire doublon, il
doit y avoir moyen de les fusionner.
Les records mutuellement inductifs restent aussi à faire.
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by the automatically infered arguments.
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recursive definitions and references to previous fields in record and
classes definitions. Fixes the corresponding typesetting issue in coqdoc
output.
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majuscule - si pas un ident ou un terme - et se terminent par un point).
Restent quelques utilisations de "error" qui sont liées à des usages internes,
ne faudrait-il pas utiliser des exceptions plus spécifiques à la place ?
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defining records. Fix test-suite script because of new implicit argument
setting for DefaultRelation. Fix regression in auto, changing the order
of tried lemmas.
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- Now [ id : Class foo ] makes id an explicit argument,
and [ Class foo ] is equivalent to [ {someid} : Class foo ].
This makes declarations such as "Class Ord [ eq : Eq a ]" have
sensible implicit args.
- Better handling of {} in class and record declarations, refactorize
code for declaring structures and classes.
- Fix merging of implicit arguments information on section closing.
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files, about definitions and type of references.
- Add missing location information on fixpoints/cofixpoint in topconstr and
syntactic definitions in vernacentries for correct dumping.
- Dump definition information in vernacentries: defs, constructors,
projections etc...
- Modify coqdoc/index.mll to use this information instead of trying to
scan the file.
- Use the type information in latex output, update coqdoc.sty accordingly.
- Use the hyperref package to do crossrefs between definition and
references to coq objects in latex.
Next step is to test and debug it on bigger developments.
On the side:
- Fix Program Let which was adding a Global definition.
- Correct implicits for well-founded Program Fixpoints.
- Add new [Method] declaration kind.
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name after internalisation, to get the correct behavior with typeclass
binders. This simplifies the pretty printing and translation
of the recursive argument name in various places too. Use this
opportunity to factorize the different internalization and
interpretation functions of binders as well.
This definitely fixes part 2 of bug
#1846 and makes it possible to use fixpoint definitions with typeclass arguments in
program too, with an example given in EquivDec.
At the same time, one fix and one enhancement in Program:
- fix a de Bruijn bug in subtac_cases
- introduce locations of obligations and use them in case the obligation tactic
raises a failure when tried on a particular obligation, as suggested by
Sean Wilson.
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works in inductive type definitions and fixpoints. The semantics of
an implicit inductive parameter is maybe a bit weird: it is implicit in the
inductive definition of constructors and the contructor types but not in
the inductive type itself (ie. to model the fact that one rarely wants A
in vector A n to be implicit but in vnil yes). Example in test-suite/
Also, correct the handling of the implicit arguments across sections.
Every definition which had no explicitely given implicit arguments was
treated as if we asked to do global automatic implicit arguments on
section closing. Hence some arguments were given implicit status for no
apparent reason.
Also correct and test the parsing rule which disambiguates between {wf
..} and {A ..}.
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implementation. Mostly syntax changes when declaring parametric
relations, but also some declarations were relying on "default"
relations on some carrier. Added a new DefaultRelation type class that
allows to do that, falling back to the last declared Equivalence
relation by default. This will be bound to Add Relation in the next
commit.
Also, move the "left" and "right" notations in Program.Utils to "in_left" and
"in_right" to avoid clashes with existing scripts.
Minor change to record to allow choosing the name of the argument for
the record in projections to avoid possible incompatibilities.
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binding, add "!" syntax for the new binders which require parameters and
not superclasses. Change backquotes for curly braces for user-given
implicit arguments, following tradition. This requires a hack a la
lpar-id-coloneq. Change ident to global for typeclass names in class
binders. Also requires a similar hack to distinguish between [ C t1 tn ]
and [ c : C t1 tn ]. Update affected theories.
While hacking the parsing of { wf }, factorized the two versions of fix
annotation parsing that were present in g_constr and g_vernac.
Add the possibility of the user optionaly giving the priority for resolve and
exact hints (used by type classes). Syntax not fixed yet: a natural
after the list of lemmas in "Hint Resolve" syntax, a natural after a "|"
after the instance constraint in Instance declarations (ex in
Morphisms.v).
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10358-10362,10365,10371-10373,10377,10383-10384,10394-10395,10398,10403-10408 via svnmerge from
svn+ssh://msozeau@scm.gforge.inria.fr/svn/coq/branches/TypeClasses
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r10358 | msozeau | 2007-12-10 15:42:53 +0100 (Mon, 10 Dec 2007) | 1 line
Comment grammar error
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r10359 | msozeau | 2007-12-10 16:04:09 +0100 (Mon, 10 Dec 2007) | 7 lines
The initial Type Classes patch.
This patch introduces type classes and instance definitions a la Haskell.
Technically, it uses the implicit arguments mechanism which was extended a bit.
The patch also introduces a notation for explicitely marking implicit, maximally inserted parameters.
It includes the tactic redefinition code too (Ltac tac ::= foo redefines tac).
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r10360 | msozeau | 2007-12-10 16:14:30 +0100 (Mon, 10 Dec 2007) | 1 line
Fix interface
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r10361 | msozeau | 2007-12-10 16:28:19 +0100 (Mon, 10 Dec 2007) | 1 line
Fix more xlate code
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r10362 | msozeau | 2007-12-11 02:00:53 +0100 (Tue, 11 Dec 2007) | 3 lines
Update coqdoc for type classes, fix proof state not being displayed on Next Obligation.
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r10365 | msozeau | 2007-12-11 14:22:35 +0100 (Tue, 11 Dec 2007) | 3 lines
Bug fixes in Instance decls.
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r10371 | msozeau | 2007-12-12 21:17:30 +0100 (Wed, 12 Dec 2007) | 3 lines
Streamline typeclass context implementation, prepare for class binders in proof statements.
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r10372 | msozeau | 2007-12-12 22:03:38 +0100 (Wed, 12 Dec 2007) | 1 line
Minor cosmetic fixes: allow sorts as typeclass param instances without parens and infer more types in class definitions
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r10373 | msozeau | 2007-12-13 00:35:09 +0100 (Thu, 13 Dec 2007) | 2 lines
Better names in g_vernac, binders in Lemmas and Context [] to introduce a typeclass context.
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r10377 | msozeau | 2007-12-13 18:34:33 +0100 (Thu, 13 Dec 2007) | 1 line
Stupid bug
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r10383 | msozeau | 2007-12-16 00:04:48 +0100 (Sun, 16 Dec 2007) | 1 line
Bug fixes in name handling and implicits, new syntax for using implicit mode in typeclass constraints
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r10384 | msozeau | 2007-12-16 15:53:24 +0100 (Sun, 16 Dec 2007) | 1 line
Streamlined implementation of instances again, the produced typeclass is a typeclass constraint. Added corresponding implicit/explicit behaviors
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r10394 | msozeau | 2007-12-18 23:42:56 +0100 (Tue, 18 Dec 2007) | 4 lines
Various fixes for implicit arguments, new "Enriching" kw to just enrich existing sets of impl args. New syntax !a to force an argument, even if not dependent.
New tactic clrewrite using a setoid typeclass implementation to do setoid_rewrite under compatible morphisms... very experimental.
Other bugs related to naming in typeclasses fixed.
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r10395 | msozeau | 2007-12-19 17:11:55 +0100 (Wed, 19 Dec 2007) | 3 lines
Progress on setoids using type classes, recognize setoid equalities in hyps better.
Streamline implementation to return more information when resolving setoids (return the results setoid).
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r10398 | msozeau | 2007-12-20 10:18:19 +0100 (Thu, 20 Dec 2007) | 1 line
Syntax change, more like Coq
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r10403 | msozeau | 2007-12-21 22:30:35 +0100 (Fri, 21 Dec 2007) | 1 line
Add right-to-left rewriting in class_setoid, fix some discharge/substitution bug, adapt test-suite to latest syntax
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r10404 | msozeau | 2007-12-24 21:47:58 +0100 (Mon, 24 Dec 2007) | 2 lines
Work on type classes based rewrite tactic.
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r10405 | msozeau | 2007-12-27 18:51:32 +0100 (Thu, 27 Dec 2007) | 2 lines
Better evar handling in pretyping, reorder theories/Program and add some tactics for dealing with subsets.
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r10406 | msozeau | 2007-12-27 18:52:05 +0100 (Thu, 27 Dec 2007) | 1 line
Forgot to add a file
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r10407 | msozeau | 2007-12-29 17:19:54 +0100 (Sat, 29 Dec 2007) | 4 lines
Generalize usage of implicit arguments in terms, up to rawconstr. Binders are decorated with binding info, either Implicit or Explicit for rawconstr. Factorizes code for typeclasses, topconstrs decorations are Default (impl|expl) or TypeClass (impl|expl) and
implicit quantification is resolve at internalization time, getting rid of the arbitrary prenex restriction on contexts.
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r10408 | msozeau | 2007-12-31 00:58:50 +0100 (Mon, 31 Dec 2007) | 4 lines
Fix parsing of subset binders, bugs in subtac_cases and handling of mutual defs obligations.
Add useful tactics to Program.Subsets.
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devient Flags.
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coinductifs à un constructeur (suggestion de Georges).
- Si pas de sorte ou arité mentionnée dans Inductive/CoInductive/Record,
Type est utilisé comme défaut.
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obligations (even an opaque one).
Change cast_type to include the converted-to type or nothing in case of a Coerce cast, required much minor changes.
Various little subtac changes.
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Adds a new kind of casts (CastCoerce) for coercing an object to its base type (e.g. inductive).
The new cast_type type subsumes usual casts ConvCasts. Much of the patch is just adding ConvCasts where needed.
The Pretyping module has been adapted to this change, although it doesn't change anything yet, but this construct could have
a use with current coercions also. Pretyping is also cleaned from the "Use type constraints under lambdas" patch which is not yet ready
for wide use. It has been transferred to a copy of the Pretyping Functor in subtac_pretyping_F.ml.
Subtac is now working as well as I demonstrated at TYPES.
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(mécanismes de renommage des noms de constantes, de module, de ltac et de certaines variables liées de lemmes et de tactiques, mécanisme d'ajout d'arguments implicites, etc.)
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Ajout de cast indiquant au kernel la strategie a suivre
Resolution du bug sur les coinductifs
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delay some computation from before to after caching time + exporting whether a projection is a true projection or a constant associated to a let in the type of the record constructor (fix a bug for canonical structures with let's)
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MOVITATION: in a forthcoming commit the application of a substitution to a
constant will return a constr and not a constant. The application of a
substitution to a kernel_name will return a kernel_name. Thus "constant"
should be use as a kernel name for references that can be delta-expanded.
KNOWN PROBLEMS: the only problem faced is in pretyping/recordops.ml (the code
that implements "Canonical Structure"s). The ADT is violated once in this
ocaml module. My feeling is that the implementation of "Canonical Structure"s
should be rewritten to avoid this situation.
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