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user contribs
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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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- Adding ability to use "_" in syntax for binders (as in "exists _:nat, True").
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unplugged a long time ago.
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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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- Backtrack on precise unfolding of "iff" in "tauto": it has effects on
the naming of hypotheses (especially when doing "case H" with H of
type "{x|P<->Q}" since not unfolding will eventually introduce a name
"i" while unfolding will eventually introduce a name "a" (deep sigh).
- Miscellaneous (error when a plugin is missing, doc hnf, standardization
of names manipulating type constr_pattern, ...).
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of the archive to install in coq user-contrib installation directory.
- Relaxed the validity check on identifiers from an error to a warning.
- Added a filtering option to Print LoadPath.
- Support for empty root in option -R.
- Better handling of redundant paths in ml loadpath.
- Makefile's: Added target initplugins and added initplugins to coqbinaries.
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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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- Added "simple apply in" (cf wish 1917) + conversion and descent
under conjunction + contraction of useless beta-redex in "apply in"
+ support for open terms.
- Did not solve the "problem" that "apply in" generates a let-in which
is type-checked using a kernel conversion in the opposite side of what
the proof indicated (hence leading to a potential unexpected penalty
at Qed time).
- When applyng a sequence of lemmas, it would have been nice to allow
temporary evars as intermediate steps but this was too long to implement.
Smoother API in tactics.mli for assert_by/assert_as/pose_proof.
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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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contrib/interface avec Arnaud)
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- make the modifiers "value of" and "type of" for "set" working (it was not!),
- clear unselected hypotheses in the "in" clause of "induction/destruct" when
the destructed term is a variable (experimental),
- support for generalization of hypotheses in the induction hypotheses using
the "in" clause of "induction" (e.g. "induction n in m, H" will
generalize over m -- would it be better to have an explicit
"over"/"generalizing" clause ?).
Added clause "as" to "apply in".
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instead of a completely resolved [constr] as input. The propagation of the
evars associated to the lemma is only allowed when the evar flag is on
(i.e. for [eapply]), otherwise they should be resolved by the end of the
application. Should be completely backwards compatible...
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- New constr_expr construct [CGeneralization of loc * binding_kind *
abstraction_kind option * constr_expr] to generalize the free vars of
the [constr_expr], binding these using [binding_kind] and making
a lambda or a pi (or deciding from the scope) using [abstraction_kind
option] (abstraction_kind = AbsLambda | AbsPi)
- Concrete syntax "`( a = 0 )" for explicit binding of [a] and "`{
... }" for implicit bindings (both "..(" and "_(" seem much more
difficult to implement). Subject to discussion! A few examples added
in a test-suite file.
- Also add missing syntax for implicit/explicit combinations for
_binders_: "{( )}" means implicit for the generalized (outer) vars,
explicit for the (inner) variable itself. Subject to discussion as well :)
- Factor much typeclass instance declaration code. We now just have to
force generalization of the term after the : in instance declarations.
One more step to using Instance for records.
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- Prise en compte des notations applicatives
- Remplacement du codage des arguments liste des notations récursives
sous forme de terme par une représentation directe (permet notamment
de résoudre un problème de stack overflow de la fonction d'affichage)
+ Correction bug affichage Lemma dans ppvernac.ml
+ Divers util.ml
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SearchAbout + referring objects by their notation).
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cases where coercion could not occur as well.
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This permits to create a database [relations] in [RelationClasses] with
a single extern tactic in it that tries to apply [reflexivity] or
[symmetry]. This is then automatically used in [auto with *] and repair
backward compatibility. The previous commit broke some scripts which were
using [intuition] to do (setoid) [reflexivity] or [symmetry]: this
worked only by accident, because the hint database of typeclasses was
used. Overrall, this also allows to put a bunch of
always-applicable, related tactics in some database or to use
[Hint Extern] but match only on hypotheses.
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making the auto apply entry. Makes indexing better and avoid polution of
[auto with *] with many abstract lemmas comming from [typeclass_instances].
Quite a nice speedup again, even Field_theory has dropped to 58s from
70s.
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syntax yet. Doesn't change the auto/eauto behavior either.
- Typeclass resolution now considers everything transparent by
default and does it consistently for "open" and closed terms.
- Correctly declare singleton classes definition as opaque for proof
search.
- Add a few initial declarations to make iff, id, compose... opaque
- Add definition of dependent signatures for dependent function types
and remove corresponding exception code in class_tactics. The
instance requires higher-order unification and is not really usable yet.
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- evarconv: mauvaise idée d'utiliser la conversion sur la tête d'un
terme applicatif au moment de tester f u1 .. un = g v1 .. vn au
premier ordre : on revient sur l'algo tel qu'il était avant le
commit 11187.
- Bug #1887 (format récursif cassé à cause de la vérification des idents).
- Nouveau choix de formattage du message "Tactic Failure".
- Nettoyage vocabulaire "match context" -> "match goal" au passage.
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- Correction divers messages d'erreur
- lorsque rien à réécrire dans une hyp,
- lorsqu'une variable ltac n'est pas liée,
- correction anomalie en présence de ?id dans le "as" de induction,
- correction mauvais env dans message d'erreur de unify_0.
- Diverses extensions et améliorations
- "specialize" :
- extension au cas (fun x1 ... xn => H u1 ... un),
- renommage au même endroit.
- "assert" et "pose proof" peuvent réutiliser la même hyp comme "specialize".
- "induction"
- intro des IH toujours au sommet même si induction sur var quantifiée,
- ajout d'un hack pour la reconnaissance de schémas inductifs comme
N_ind_double mais il reste du boulot pour reconnaître (et/ou
réordonner) les composantes d'un schéma dont les hypothèses ne sont pas
dans l'ordre standard,
- vérification de longueur et éventuelle complétion des
intropatterns dans le cas de sous-patterns destructifs dans induction
(par exemple "destruct n as [|[|]]" sur "forall n, n=0" ne mettait pas
le n dans le contexte),
- localisation des erreurs d'intropattern,
- ajout d'un pattern optionnel après "as" pour forcer une égalité et la
nommer (*).
- "apply" accepte plusieurs arguments séparés par des virgules (*).
- Plus de robustesse pour clear en présence d'evars.
- Amélioration affichage TacFun dans Print Ltac.
- Vieux pb espace en trop en tête d'affichage des tactiques EXTEND résolu
(incidemment, ça remodifie une nouvelle fois le test output Fixpoint.v !).
- Fusion VTactic/VFun dans l'espoir.
- Mise en place d'un système de trace de la pile des appels Ltac (tout en
préservant certains aspects de la récursivité terminale - cf bug #468).
- Tactiques primitives
- ajout de "move before" dans les tactiques primitives et ajout des
syntaxes move before et move dependent au niveau utilisateur (*),
- internal_cut peuvent faire du remplacement de nom d'hypothèse existant,
- suppression de Intro_replacing et du code sous-traitant
- Nettoyage
- Suppression cible et fichiers minicoq non portés depuis longtemps.
(*) Extensions de syntaxe qu'il pourrait être opportun de discuter
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effacé dans un intro-pattern (suggéré par ssreflect).
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discriminate/injection/simplify_eq.
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disambiguate syntax:
[ H := [ ?x ] : context C [ foo ] |- _ ] is ok, as well as [ H := ?x :
nat |- _ ] or [H := foo |- _ ], but [ H := ?x : context C [ foo ] ] will
not parse.
Add applicative contexts in tactics match, to be able to match arbitrary partial
applications, e.g.: match f 0 1 2 with appcontext C [ f ?x ] => ... end
will bind C to [ ∙ 1 2 ] and x to 0.
Minor improvements in coqdoc.
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- Changement au passage de la convention "at -n1 ... -n2" en
"at - n1 ... n2" qui me paraît plus clair à partir du moment où on peut
pas mélanger des positifs et des négatifs.
- Au passage:
- simplification de gclause avec fusion de onconcl et concl_occs,
- généralisation de l'utilisation de la désignation des occurrences par la
négative aux cas de setoid_rewrite, clrewrite et rewrite at,
- correction d'un bug de "rewrite in at" qui utilisait le at de la
conclusion dans les hyps.
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- Ajout clause "in" à "remember" (et passage du code en ML).
- Ajout clause "in" à "induction"/"destruct" qui, en ce cas, ajoute
aussi une égalité pour se souvenir du terme sur lequel l'induction
ou l'analyse de cas s'applique.
- Ajout "pose t as id" en standard (Matthieu: j'ai enlevé celui de
Programs qui avait la sémantique de "pose proof" tandis que le nouveau
a la même sémantique que "pose (id:=t)").
- Un peu de réorganisation, uniformisation de noms dans Arith, et
ajout EqNat dans Arith.
- Documentation tactiques et notations de tactiques.
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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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change the default pretty-printing to use Π, λ instead of
forall and fun (and allow "," as well as "=>" for "fun" to be more
consistent with the standard forall and exists syntax). Parsing allows
theses new forms too, even if not in -unicode, and does not make Π or
λ keywords. As usual, criticism and suggestions are welcome :)
Not sure what to do about "->"/"→" ?
- [setoid_replace by] now uses tactic3() to get the right parsing level
for tactics.
- Type class [Instance] names are now mandatory.
- Document [rewrite at/by] and fix parsing of occs to support their
combination.
- Backtrack on [Enriching] modifier, now used exclusively in the
implementation of implicit arguments.
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binders.
- Change syntax of type class instances to better match the usual syntax of
lemmas/definitions with name first, then arguments ":" instance.
Update theories/Classes accordingly.
- Correct globalization of tactic references when doing Ltac :=/::=, update
documentation.
- Remove the not so useful "(x &)" and "{{x}}" syntaxes from
Program.Utils, and subset_scope as well.
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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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des théorèmes prouvés par récursion ou corécursion mutuelle.
Correction au passage du parsing et du printing des tactiques
fix/cofix et documentation de ces tactiques.
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semantics.
- Add an Equivalence instance for pointwise equality from an
Equivalence on the codomain of a function type, used by default when
comparing functions with the Setoid's ===/equiv.
- Partially fix the auto hint database "add" function where the exact
same lemma could be added twice (happens when doing load for example).
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- vérification de la cohérence des ident pour éviter une option -R
avec des noms non parsables (la vérification est faite dans
id_of_string ce qui est très exigeant; faudrait-il une solution plus
souple ?)
- correction message d'erreur inapproprié dans le apply qui descend dans les
conjonctions
- nettoyage autour de l'échec en présence de métas dans le prim_refiner
- nouveau message d'erreur quand des variables ne peuvent être instanciées
- quelques simplifications et davantage de robustesse dans inversion
- factorisation du code de constructor and co avec celui de econstructor and co
Documentation des tactiques
- edestruct/einduction/ecase/eelim et nouveautés apply
- nouvelle sémantique des intropatterns disjonctifs et documentation des
pattern -> et <-
- relecture de certaines parties du chapitre tactique
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- ajout de -> et <- pour substitution immédiate d'une égalité
(comportement à la subst si variable, à la rewrite in * sinon)
- ajout possibilité d'hypothèses avec paramètres
- correction d'un comportement bizarre de l'utilisation des noms dans
cas "[[|] H]" (cf CHANGES)
Ce serait bien d'avoir quelque chose comme "intros (H as <-) (H' as [ | ])"
pour décider de garder les noms, mais la syntaxe est assez
moche. Peut-être un "intros H: <- H': [ | ]" ?
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[in I] := t [return pred] in b", just as SSReflect does with let:.
Change implementation: no longer a separate AST node, just add a case_style
annotation on Cases to indicate it (if ML was dependently typed we
could ensure that LetPatternStyle Cases have only one term to be
matched and one branch, alas...). This factors out most code and we lose
no functionality (win ! win !). Add LetPat.v test suite.
- Slight improvement of inference of return clauses for dependent
pattern matching. If matching a variable of non-dependent type
under a tycon that mentions it while giving no return clause, the
dependency will be automatically infered. Examples at the end of
DepPat. Should get rid of most explicit returns under tycons.
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* "f_equal" is now a tactic in ML (placed alongside congruence since
it uses it). Normally, it should be completely compatible with the
former Ltac version, except that it doesn't suffer anymore from the
"up to 5 args" earlier limitation.
* "revert" also becomes an ML tactic. This doesn't bring any real
improvement, just some more uniformity with clear and generalize.
* The experimental "narrow" tactic is removed from Tactics.v, and
replaced by an evolution of the old & undocumented "specialize"
ML tactic:
- when specialize is called on an hyp H, the specialization is
now done in place on H. For instance "specialize (H t u v)"
removes the three leading forall of H and intantiates them by
t u and v.
- otherwise specialize still works as before (i.e. as a kind of
generalize).
See the RefMan and test-suite/accept/specialize.v for more infos.
Btw, specialize can still accept an optional number for specifying
how many premises to instantiate. This number should normally
be useless now (some autodetection mecanism added). Hence this
feature is left undocumented. For the happy few still using
specialize in the old manner, beware of the slight incompatibities...
* finally, "contradict" is left as Ltac in Tactics.v, but it has
now a better shape (accepts unfolded nots and/or things in Type),
and also some documentation in the RefMan
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of the fix I added an optional "by" annotation for rewrite to solve said
conditions in the same tactic call. Most of the theories have been
updated, only FSets is missing, Pierre will take care of it.
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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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1) changed the semantics of rewrite H,H' : the earlier semantics
(rewrite H,H' == rewrite H; rewrite H') was poorly suited for
situations where first rewrite H generates side-conditions.
New semantics is tclTHENFIRST instead of tclTHEN, that is
side-conditions are left untouched.
Note to myself: check if side-effect-come-first bug of
setoid rewrite is still alive, and do something if yes
2) new syntax for rewriting something many times. This syntax is
shamelessly taken from ssreflect:
rewrite ?H means "H as many times as possible"
(i.e. almost repeat rewrite H, except that
possible side-conditions are left apart as in 1)
rewrite !H means "at least once" (i.e. rewrite H; repeat rewrite H)
rewrite 3?H means "up to 3 times", maybe less
(i.e. something like: do 3 (try rewrite H)).
rewrite 3!H means "exactly 3 times" (i.e. almost do 3 rewrite H).
For instance: rewrite 3?foo, <-2!bar in H1,H2|-*
3) By the way, for a try, I've enabled the syntax +/- as synonyms for
->/<- in the orientation of rewrite.
Comments welcome ...
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kernel:
-declaration.ml
unification des representations pour les modules et modules types.
(type struct_expr_body)
-mod_typing.ml
le typage des modules est separe de l'evaluation des modules
-modops.ml
nouvelle fonction qui pour toutes expressions de structure calcule
sa forme evaluee.(eval_struct)
-safe_typing.ml
ajout du support du nouvel operateur Include.(add_include).
library:
-declaremods.ml
nouveaux objets Include et Module-alias et gestion de la resolution de noms pour
les alias via la nametab.
parsing:
-g_vernac.ml4:
nouvelles regles pour le support des Includes et pour l'application des signatures
fonctorielles.
extraction:
Adaptation a la nouvelle representation des modules et support de l'operateur with.
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