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hb.elpi
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/* Hierarchy Builder: algebraic hierarchies made easy
This software is released under the terms of the MIT license */
%%%%%%% Naming converntions %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
/*
- under-foobar.do! Arg [ Code ]
enriches the context with foobar, the runs std.do! [ Code ]
- under-foobar.then Arg F Out
enriches the context with foobar, the runs F Out, as a consequence
the spilling expression {under-foobar.then Arg F} can be used
- foo_bar
projection from foo to its field bar
- foo->bar
conversion from type foo to type bar (it can be arbitrarily complex)
- get-foobar
reads foobar from the Coq world
- findall-foobar
reads foobar from hb.db, the output is sorted whenever it makes sense
- main-foobar
main entry point for a user facing (or almost user facing) command foobar
- declare-foobar
predicate adding to the Coq ennvironment a foobar
- postulate-foobar
predicate assuming a foobar (declaring a Coq section variable)
- TheType, TheClass, TheFoobar
the thing the current code is working on, eg the type of the structure
begin defined
- FooAlias
see phant-abbrev, used to talk about the non canonical name of Foo
- when foo is the constructor of a data type with type A1 -> .. -> AN -> t
we define mk-foo as:
mk-foo A1 .. AN (foo A1 .. AN)
*/
shorten coq.{ term->gref, subst-fun, safe-dest-app, mk-app, mk-eta, subst-prod }.
%%%%%%%%% Elpi Utils %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% This code could be moved in Elpi's standard library
% printing the local mixin context
pred print-ctx.
print-ctx :- declare_constraint print-ctx [].
constraint print-ctx mixin-src {
rule \ (G ?- print-ctx) | (coq.say "The context is:" G).
}
% TODO: pred toposort i:(A -> A -> prop), i:list A, o:list A.
% pred edge? i:int, i:int.
% toposort edge? [1,2,3,4] TopoList
pred topovisit i: list (pair A A), i: A, i: list A, i: list A, o: list A, o: list A.
topovisit _ X VS PS VS PS :- std.mem PS X, !.
topovisit _ X VS _ _ _ :- std.mem VS X, !, halt "cycle detected.".
topovisit ES X VS PS VS' [X|PS'] :-
toporec ES {std.map {std.filter ES (e\ fst e X)} snd} [X|VS] PS VS' PS'.
pred toporec i: list (pair A A), i: list A, i: list A, i: list A, o: list A, o: list A.
toporec _ [] VS PS VS PS.
toporec ES [X|XS] VS PS VS'' PS'' :-
topovisit ES X VS PS VS' PS', toporec ES XS VS' PS' VS'' PS''.
pred toposort i: list (pair A A), i: list A, o: list A.
toposort ES XS XS'' :-
toporec ES XS [] [] _ XS',
std.filter XS' (std.mem XS) XS''.
pred bubblesort i:list A, i:(A -> A -> prop), o:list A.
bubblesort [] _ [] :- !.
bubblesort [X] _ [X] :- !.
bubblesort [X,Y|TL] Rel [X|Rest1] :- Rel X Y, !, bubblesort [Y|TL] Rel Rest1.
bubblesort [X,Y|TL] Rel [Y|Rest1] :- bubblesort [X|TL] Rel Rest1.
pred list-diff i:list A, i:list A, o:list A.
list-diff X [] X.
list-diff L [D|DS] R :-
std.filter L (x\ not(x = D)) L1,
list-diff L1 DS R.
pred list-eq-set i:list A, i:list A.
list-eq-set L1 L2 :- list-diff L1 L2 [], list-diff L2 L1 [].
pred mk-n-holes i:int, o:list A.
mk-n-holes 0 [] :- !.
mk-n-holes N [HOLE_|R] :- M is N - 1, mk-n-holes M R.
pred under.do! i:((A -> Prop) -> A -> prop), i:list prop.
under.do! Then LP :- Then (_\ std.do! LP) _.
%%%%% HB Utils %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% API, compat between 8.10 and 8.11
pred add-abbrev i:id, i:int, i:term, i:global?, i:bool, o:abbreviation.
add-abbrev N NParams AbbrevT Global OnlyParse Abbrev :-
if (coq.version _ 8 10 _)
(std.unsafe-cast coq.notation.add-abbreviation F, F N NParams AbbrevT Global OnlyParse Abbrev)
(std.unsafe-cast coq.notation.add-abbreviation G, G N NParams AbbrevT Global OnlyParse _ Abbrev). % 8.11 has a deprecation flag
% runs P in a context where Coq #[attributes] are parsed
pred with-attributes i:prop.
with-attributes P :-
attributes A, coq.parse-attributes A [att "verbose" bool] Opts, !,
Opts => P.
pred if-verbose i:prop.
if-verbose P :- get-option "verbose" tt, !, P.
if-verbose _.
% TODO: Should this only be used for gref that are factories? (and check in the first/second branch so?)
% Should we make this an HO predicate, eg "located->gref S L is-factory? GR"
pred located->gref i:string, i:list located, o:gref.
located->gref _ [loc-gref GR|_] GR.
located->gref _ [loc-abbreviation Abbrev|_] GR :- phant-abbrev GR _ Abbrev, !.
located->gref S [loc-abbreviation _|_] _ :- coq.error S "is an abbreviation out of the control of HB".
located->gref S [loc-modpath _|_] _ :- coq.error S "should be a factory, but is a module".
located->gref S [loc-modtypath _|_] _ :- coq.error S "should be a factory, but is a module type".
located->gref S [] _ :- coq.error "Could not locate name" S.
% TODO: generalize/rename when we support parameters
pred argument->gref i:argument, o:gref.
argument->gref (str S) GR :- located->gref S {coq.locate-all S} GR.
argument->gref X _ :- coq.error "Argument" X "is expected to be a string".
pred argument->term i:argument, o:term.
argument->term (str S) (global GR) :- !, argument->gref (str S) GR.
argument->term (trm T) T :- !, std.assert-ok! (coq.typecheck T _) "not well typed term".
argument->term X _ :- coq.error "Argument" X " is expected to be a term or a string".
% Type to share code between HB.mixin and HB.factory (that supports alias factories)
kind asset type.
type asset-mixin asset.
type asset-factory asset.
kind asset-decl type.
type asset-parameter id -> term -> (term -> asset-decl) -> asset-decl.
type asset-record id -> term -> id -> record-decl -> asset-decl.
type asset-alias id -> term -> asset-decl.
pred name-of-asset-decl i:asset-decl, o:string.
name-of-asset-decl (asset-parameter _ _ R) X :-
pi x\ name-of-asset-decl (R x) X.
name-of-asset-decl (asset-record X _ _ _) X.
name-of-asset-decl (asset-alias X _) X.
pred argument->asset i:argument, o:asset-decl.
argument->asset (indt-decl (parameter ID _ImplicitStatus Ty I)) (asset-parameter ID Ty A) :- !,
% Should we check that _ImplicitStatus is explicit?
coq.string->name ID Name,
@pi-decl Name Ty a\
argument->asset (indt-decl (I a)) (A a).
argument->asset (indt-decl (record Rid Ty Kid F)) (asset-record Rid Ty Kid F) :- !.
argument->asset (const-decl Id (some (fun _ _ Bo)) (parameter ID _ Src Ty)) (asset-parameter ID Src A) :- !,
coq.id->name ID Name,
@pi-decl Name Src a\
argument->asset (const-decl Id (some (Bo a)) (Ty a)) (A a).
argument->asset (const-decl Id (some Bo) (arity Ty)) (asset-alias Id Bo) :- !,
std.assert! (var Ty) "Factories aliases should not be given a type".
argument->asset X _ :- coq.error "Unsupported asset:" X.
pred builder->string i:builder, o:string.
builder->string (builder _ _ B) S :- coq.term->string B S.
pred nice-gref->string i:gref, o:string.
nice-gref->string X Mod :-
coq.gref->path X Path,
std.rev Path [_,Mod|_].
nice-gref->string X S :-
coq.term->string (global X) S.
pred target-gref i:term, o:gref.
target-gref T GR :- whd1 T T1, !, target-gref T1 GR.
target-gref (prod N Src Tgt) GR :- !, @pi-decl N Src x\ target-gref (Tgt x) GR.
target-gref End GR :- term->gref End GR.
% Sometimes section variables are unused, hence the lambda may not be there
pred subst-fun-opt i:term, i:term, o:term.
subst-fun-opt T (fun _ _ _ as F) O :- !, subst-fun [T] F O.
subst-fun-opt T (let _ _ _ _ as F) O :- !, subst-fun [T] F O.
subst-fun-opt _ X X.
pred append-phant-unify i:phant-term, o:phant-term.
append-phant-unify (phant-term LP T) (phant-term LPU T) :-
std.append LP [unify-arg] LPU.
pred copy-fields i:record-decl, o:record-decl.
copy-fields end-record end-record.
copy-fields (field C N T R) (field C N T1 R1) :-
copy T T1,
pi x\ copy x x => copy-fields (R x) (R1 x).
pred copy-triple i:(A -> A1 -> prop), i:(B -> B1 -> prop), i:(C -> C1 -> prop), i:triple A B C, o:triple A1 B1 C1.
copy-triple F G H (triple X Y Z) (triple X1 Y1 Z1) :- F X X1, G Y Y1, H Z Z1.
pred triple_1 i:triple A B C, o:A.
triple_1 (triple A _ _) A.
pred copy-list i:(A -> A1 -> prop), i:list A, o: list A1.
copy-list _ [] [].
copy-list F [X|XS] [Y|YS] :- F X Y, copy-list F XS YS.
pred gref->modname i:mixinname, o:id.
gref->modname GR ModName :-
coq.gref->path GR Path,
if (std.rev Path [_,ModName|_]) true (coq.error "No enclosing module for " GR).
pred term->modname i:structure, o:id.
term->modname T ModName :- gref->modname {term->gref T} ModName.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% function to predicate generic constructions %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
pred mk-nil o:any.
mk-nil [].
pred mk0 i:any, o:any.
mk0 F R :- constant R F [].
pred mk1 i:any, i:any, o:any.
mk1 F X1 R :- constant R F [X1].
pred mk2 i:any, i:any, i:any, o:any.
mk2 F X1 X2 R :- constant R F [X1, X2].
pred mk3 i:any, i:any, i:any, i:any, o:any.
mk3 F X1 X2 X3 R :- constant R F [X1, X2, X3].
pred mk4 i:any, i:any, i:any, i:any, i:any, o:any.
mk4 F X1 X2 X3 X4 R :- constant R F [X1, X2, X3,X4].
pred mk-fun i:name, i:term, i:(term -> term), o:term.
mk-fun N Ty Body (fun N Ty Body).
% generic argument to pass to w-params
pred ignore i:name, i:term, i:(term -> A), o:A.
ignore _ _ F X :- (pi x y\ F x = F y), X = F (sort prop).
% combining body and type
pred mk-fun-prod i:name, i:term, o:(term -> pair term term), o:pair term term.
mk-fun-prod N Ty (x\ pr (Body x) (Type x)) (pr (fun N Ty Body) (prod N Ty Type)).
pred mk-parameter i:implicit_kind, i:name, i:term, i:(term -> indt-decl), o:indt-decl.
mk-parameter IK Name X F Decl :- !, Decl = parameter {coq.name->id Name} IK X F.
%%%%%%%%%%%%%%%%%%%%%%
% w-params interface %
%%%%%%%%%%%%%%%%%%%%%%
pred apply-w-params i:w-params A, i:list term, i:term, o:A.
apply-w-params (w-params.cons _ _ PL) [P|PS] T R :- !, apply-w-params (PL P) PS T R.
apply-w-params (w-params.nil _ _ L) [] T R :- !, R = L T.
apply-w-params _ _ _ _ :- coq.error "apply-w-params".
pred w-params.nparams i:w-params A, o:int.
w-params.nparams (w-params.cons _ _ F) N :- pi x\ w-params.nparams (F x) M, N is M + 1.
w-params.nparams (w-params.nil _ _ _) 0.
% [w-params.fold AwP Cons Nil Out] states that Out has shape
% Cons `x_1` T_1 p_1 \ .. \ Nil [p_1 .. p_n] `T` Ty F
% where AwP = w-params.cons `x_1` T_1 p_1 \ ... \ w-params.nil `T` Ty F
pred w-params.fold i:w-params A, i:(name -> term -> (term -> B) -> B -> prop),
i:(list term -> name -> term -> (term -> A) -> B -> prop), o:B.
w-params.fold L Cons Nil Out :- w-params.fold.params L Cons Nil [] Out.
pred w-params.fold.params i:w-params A,
i:(name -> term -> (term -> B) -> B -> prop),
i:(list term -> name -> term -> (term -> A) -> B -> prop),
i:list term, % accumulator
o:B.
w-params.fold.params (w-params.cons N PTy F) Cons Nil RevPs Out :- !, std.do! [
(@pi-decl N PTy p\ w-params.fold.params (F p) Cons Nil [p|RevPs] (Body p)),
Cons N PTy Body Out].
w-params.fold.params (w-params.nil NT TTy F) _ Nil RevParams Out :- !,
std.rev RevParams Params, !, Nil Params NT TTy F Out.
% [w-params.then AwP Cons Nil Out] states that Out has shape
% Cons `x_1` T_1 p_1 \ .. \ Nil [p_1 .. p_n] `T` Ty t \ Body
% where Pred [p_1 .. p_n] T Body
% and AwP = w-params.cons `x_1` T_1 p_1 \ ... \ w-params.nil `T` Ty F
pred w-params.then i:w-params A,
i:(name -> term -> (term -> C) -> C -> prop),
i:(name -> term -> (term -> B) -> C -> prop),
i:(list term -> term -> A -> B -> prop),
o:C.
w-params.then L Cons Nil Pred Out :-
w-params.fold L Cons (ps\ n\ ty\ f\ out\ sigma Body\
(@pi-decl n ty t\ Pred ps t (f t) (Body t)),
Nil n ty Body out) Out.
pred w-params.map i:w-params A, i:(list term -> term -> A -> B -> prop), o:w-params B.
w-params.map AL F BL :- w-params.then AL (mk3 w-params.cons) (mk3 w-params.nil) F BL.
% on the fly abstraction
pred bind-nil i:name, i:term, i:term, i:A, o:w-params A.
bind-nil N T X V (w-params.nil N T A) :- V = A X.
pred bind-cons i:name, i:term, i:term, i:w-params A, o:w-params A.
bind-cons N T X V (w-params.cons N T A) :- V = A X.
% Specific to list-w-params
pred list-w-params_list i:list-w-params A, o:list A.
list-w-params_list AwP R :- w-params.then AwP ignore ignore
(p\ t\ x\ std.map x triple_1) R.
pred list-w-params.append i:list-w-params A, i:list-w-params A, o:list-w-params A.
list-w-params.append (w-params.nil N T ML1) (w-params.nil N T ML2) (w-params.nil N T ML) :-
pi x\ std.append (ML1 x) (ML2 x) (ML x).
list-w-params.append (w-params.cons N Ty ML1) (w-params.cons N Ty ML2) (w-params.cons N Ty ML) :-
pi x\ list-w-params.append (ML1 x) (ML2 x) (ML x).
pred list-w-params.flatten-map
i:list-w-params A,
i:(A -> list-w-params B -> prop),
o:list-w-params B.
list-w-params.flatten-map (w-params.cons N T L) F (w-params.cons N T L1) :-
@pi-decl N T p\
list-w-params.flatten-map (L p) F (L1 p).
list-w-params.flatten-map (w-params.nil N TTy L) F (w-params.nil N TTy L1) :-
@pi-decl N TTy t\
list-w-params.flatten-map.aux (L t) F (L1 t).
pred list-w-params.flatten-map.aux
i:list (w-args A), i:(A -> list-w-params B -> prop), o:list (w-args B).
list-w-params.flatten-map.aux [] _ [].
list-w-params.flatten-map.aux [triple M Ps T|L] F Res1 :-
F M MwP,
apply-w-params MwP Ps T ML,
list-w-params.flatten-map.aux L F Res,
std.append ML Res Res1.
% [build-list-w-params TheParams TheType Factorties ListWParams]
% Params is a list of pairs (section variable, its type).
% ListWParams has as many w-params.cons as TheParams and the terms
% in Factories are abstracted wrt the first component of TheParams.
pred build-list-w-params i:list (pair term term), i:term, i:list (w-args A), o: list-w-params A.
build-list-w-params [pr P Pty|PS] TheType Factories (w-params.cons `p` Pty1 R) :- std.do! [
copy Pty Pty1,
(pi p\ (copy P p :- !) => build-list-w-params PS TheType Factories (R p)),
].
build-list-w-params [] TheType Factories (w-params.nil `t` TT R) :- std.do! [
std.assert-ok! (coq.typecheck TheType TT) "BUG: TheType does not typecheck",
(pi t\ (copy TheType t :- !) =>
std.map Factories (copy-triple (=) (copy-list copy) copy) (R t)),
].
pred distribute-w-params i:list-w-params A, o:list (one-w-params A).
distribute-w-params (w-params.cons N T F) L :-
pi x\ distribute-w-params (F x) (L1 x), std.map (L1 x) (bind-cons N T x) L.
distribute-w-params (w-params.nil N T F) L :-
pi x\ std.map (F x) (bind-nil N T x) L.
% Specific to one-w-params
pred w-params_1 i:one-w-params A, o:A.
w-params_1 X Y :- w-params.then X ignore ignore (p\ t\ triple_1) Y.
%%%%%%%%% HB database %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%Specialize coq.elpi.accumulate to "hiearchy.db"
pred acc i:scope, i:clause.
acc S CL :- coq.elpi.accumulate S "hb.db" CL.
pred from_mixin i:prop, o:mixinname.
from_mixin (from _ X _) X.
pred from_builder i:prop, o:term.
from_builder (from _ _ X) X.
pred mixin-src_mixin i:prop, o:mixinname.
mixin-src_mixin (mixin-src _ M _) M.
pred extract-builder i:prop, o:builder.
extract-builder (builder-decl B) B.
pred leq-builder i:builder, i:builder.
leq-builder (builder N _ _) (builder M _ _) :- N =< M.
% [factory-alias->gref X GR] when X is already a factory X = GR
% however, when X is a phantom abbreviated gref, we find the underlying
% factory gref GR associated to it.
pred factory-alias->gref i:gref, o:gref.
factory-alias->gref PhGR GR :- phant-abbrev GR PhGR _, !.
factory-alias->gref GR GR :- phant-abbrev GR _ _, !.
pred sub-class? i:class, i:class.
sub-class? (class _ _ ML1P) (class _ _ ML2P) :-
list-w-params_list ML1P ML1,
list-w-params_list ML2P ML2,
std.forall ML2 (m2\ std.exists ML1 (m1\ m1 = m2)).
% TODO: maybe the right API is to have this
% pred factory-provides i:factoryname, i:list-w-params mixiname.
% one can use w-params.then now!
% [factory-provides F ML] computes the mixins ML generated by F
pred factory-provides i:factoryname, o:list-w-params mixinname.
factory-provides FactoryAlias MLwP :- std.do! [
factory-alias->gref FactoryAlias Factory,
factory-requires Factory RMLwP,
w-params.map RMLwP (factory-provides.base Factory) MLwP
].
pred factory-provides.base i:factoryname, i:list term, i: term,
i:list (w-args mixinname), o:list (w-args mixinname).
factory-provides.base Factory Params T _RMLwP MLwP :- std.do! [
std.findall (from Factory T_ F_) All,
std.map All from_mixin ML,
std.map All from_builder BL,
std.map2 BL ML (factory-provides.one Params T) MLwP,
].
pred factory-provides.one i:list term, i:term, i:term, i:mixinname, o:w-args mixinname.
factory-provides.one Params T B M (triple M PL T) :- std.do! [
std.assert-ok! (coq.typecheck B Ty) "Builder illtyped",
subst-prod [T] {subst-prod Params Ty} TyParams,
std.assert! (extract-conclusion-params TyParams PL) "The conclusion of a builder is a mixin whose parameters depend on other mixins",
].
pred extract-conclusion-params i:term, o:list term.
extract-conclusion-params (prod _ S T) R :- !,
@pi-decl _ S x\ extract-conclusion-params (T x) R.
extract-conclusion-params (app [global GR|Args]) R :- !,
factory-alias->gref GR Factory,
factory-nparams Factory NP,
std.take NP Args R.
extract-conclusion-params T R :- whd1 T T1, !, extract-conclusion-params T1 R.
% [factories-provide FL ML] computes the mixins ML generated by all F in FL
%
% cons tp p\ nil t\ [pr f1 [p,t]]
% f1 p t = m1 t, m2 p t
% cons tp p\ nil t\ [pr m1 [t], pr m2 [p,t]]
pred factories-provide i:list-w-params factoryname, o:list-w-params mixinname.
factories-provide FLwP MLwP :-
list-w-params.flatten-map FLwP factory-provides UnsortedMLwP,
w-params.map UnsortedMLwP (p\t\ toposort-mixins) MLwP.
% Mixins can be topologically sorted according to their dependencies
pred toposort-mixins.mk-mixin-edge i:prop, o:list (pair mixinname mixinname).
toposort-mixins.mk-mixin-edge (factory-requires M Deps) L :-
std.map {list-w-params_list Deps} (d\r\ r = pr d M) L.
pred toposort-mixins i:list (w-args mixinname), o:list (w-args mixinname).
toposort-mixins In Out :- std.do! [
std.findall (factory-requires M_ Deps_) AllMixins,
std.flatten {std.map AllMixins toposort-mixins.mk-mixin-edge} ES,
toposort-proj triple_1 ES In Out,
].
pred toposort-proj i:(A -> B -> prop), i:list (pair B B), i:list A, o:list A.
toposort-proj Proj ES In Out :- !, toposort-proj.acc Proj ES [] In Out.
pred topo-find i:B, o:A.
pred toposort-proj.acc i:(A -> B -> prop), i:list (pair B B), i:list B, i:list A, o:list A.
toposort-proj.acc _ ES Acc [] Out :- !,
std.map {toposort ES Acc} topo-find Out.
toposort-proj.acc Proj ES Acc [A|In] Out :- std.do![
Proj A B,
topo-find B A => toposort-proj.acc Proj ES [B|Acc] In Out
].
% Classes can be topologically sorted according to the subclass relation
pred toposort-classes.mk-class-edge i:prop, o:pair class class.
toposort-classes.mk-class-edge (sub-class C1 C2) (pr C2 C1).
pred toposort-classes i:list class, o:list class.
toposort-classes In Out :- std.do! [
std.findall (sub-class C1_ C2_) SubClasses,
std.map SubClasses toposort-classes.mk-class-edge ES,
toposort ES In Out,
].
pred findall-classes o:list class.
findall-classes CLSorted :- std.do! [
std.findall (class-def C_) All,
std.map All (x\r\ x = class-def r) CL,
toposort-classes CL CLSorted
].
pred findall-builders o:list builder.
findall-builders LFIL :-
std.map {std.findall (builder-decl B_)} extract-builder LFILunsorted,
bubblesort LFILunsorted leq-builder LFIL.
% [distinct-pairs-below C AllSuper C1 C2] finds C1 and C2 in
% AllSuper (all super classes of C) such that C1 != C2
% and for which there is no join C3.
% If there exists a join C3 of C1 and C2 then C is a subclass
% of C3 (otherwise C should have been declared before C3)
%
% / --- /-- C1
% C -- no C3 !=
% \ --- \-- C2
%
% [findall-newjoins C AllSuper] finds all C1 and C2 such that C is a (new) join for
% them
pred distinct-pairs-below i:class, i:list class, o:class, o:class.
distinct-pairs-below CurrentClass AllSuper C1 C2 :-
std.mem AllSuper C1, std.mem AllSuper C2,
% no cut until here, since we don't know which C1 and C2 to pick
std.do! [
cmp_term C1 C2 lt,
C1 = class C1n _ _,
C2 = class C2n _ _ ,
not(sub-class? C1 C2),
not(sub-class? C2 C1),
if (join C1n C2n C3n)
(assert-building-bottom-up CurrentClass C3n, fail) % a join, not a valid pair
true, % no join, valid pair
].
pred assert-building-bottom-up i:class, i:classname.
assert-building-bottom-up CurrentClass C3n :-
class-def (class C3n X Y),
if (not (sub-class? CurrentClass (class C3n X Y)))
(coq.error "You must declare" CurrentClass "before" C3n)
true.
pred distinct-pairs_pair i:prop, o:pair class class.
distinct-pairs_pair (distinct-pairs-below _ _ X Y) (pr X Y).
pred findall-newjoins i:class, i:list class, o:list (pair class class).
findall-newjoins CurrentClass AllSuper TodoJoins :-
std.findall (distinct-pairs-below CurrentClass AllSuper C1_ C2_) JoinOf,
std.map JoinOf distinct-pairs_pair TodoJoins.
%%%%% Coq Database %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% [get-structure-coercion S1 S2 F] finds the coecion F from the structure S1 to S2
pred get-structure-coercion i:structure, i:structure, o:term.
get-structure-coercion (global S) (global T) (global F) :-
coq.coercion.db-for (grefclass S) (grefclass T) L,
if (L = [pr F 0]) true (coq.error "No one step coercion from" S "to" T).
pred get-structure-sort-projection i:structure, o:term.
get-structure-sort-projection (global (indt S)) (global (const P)) :-
coq.CS.canonical-projections S L,
if (L = [some P, _]) true (coq.error "No canonical sort projection for" S).
pred get-structure-class-projection i:structure, o:term.
get-structure-class-projection (global (indt S)) (global (const P)) :-
coq.CS.canonical-projections S L,
if (L = [_, some P]) true (coq.error "No canonical class projection for" S).
pred get-constructor i:term, o:gref.
get-constructor (global (indt R) as S) (indc K) :- !,
if (coq.env.indt R _ _ _ _ [K] _) true (coq.error "Not a record" S).
pred safe-head i:term, o:term.
safe-head (prod N T Body) Hd :-
@pi-decl N T x\
safe-head (Body x) (Hd' x),
std.assert! (Hd' x = Hd) "safe-head: the head symbol is a bound variable".
safe-head T Hd :- whd1 T T', safe-head T' Hd.
safe-head T Hd :- safe-dest-app T Hd _.
%% finding for locally defined structures
pred get-cs-structure i:cs-instance, o:term.
get-cs-structure (cs-instance _ _ (global Inst)) Struct :- std.do! [
coq.env.typeof Inst InstTy,
safe-head InstTy Struct
].
pred has-cs-instance i:gref, i:cs-instance.
has-cs-instance GTy (cs-instance _ (cs-gref GTy) _).
pred get-local-structures i:term, o:list term.
get-local-structures TyTrm StructL :- std.do! [
std.filter {coq.CS.db} (has-cs-instance {term->gref TyTrm}) DBGTyL,
std.map DBGTyL get-cs-structure RecL,
std.filter RecL is-structure StructL
].
pred local-cs? i:term, i:term.
local-cs? TyTerm Struct :-
get-local-structures TyTerm StructL,
std.mem! StructL Struct.
pred get-canonical-mixins-of i:term, i:structure, o:list prop.
get-canonical-mixins-of T S MSL :- std.do! [
get-structure-sort-projection S Sort,
std.assert-ok! (coq.unify-eq T (app [Sort, ST])) "HB: get-canonical-mixins-of: T = sort ST",
% Hum, this unification problem is not super trivial. TODO replace by something simpler
get-constructor S KS,
std.assert-ok! (coq.unify-eq ST (app [global KS, _, C])) "HB: get-canonical-mixins-of: ST = _ _ C",
C = app [_, _ | MIL],
std.map MIL (mixin-srcs T) MSLL,
std.flatten MSLL MSL
].
pred under-canonical-mixins-of.do! i:term, i:list prop.
under-canonical-mixins-of.do! T P :-
get-local-structures T CS,
std.map CS (get-canonical-mixins-of T) MSLL,
std.flatten MSLL MSL,
MSL => std.do! P.
%%%%% mterm %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% mterm is always of the form [mterm P T ML F], which is the data of
% parameters PL a type T, and a list of mixins ML and a term F
% where F should applied to PL, T and instances of the mixins in ML
kind mterm type.
type mterm list term -> term -> list mixinname -> term -> mterm.
% Notations /à la/ *pack* are always of the shape
% [Notation N x_0 .. x_n := C x_0 .. _ _ id .. x_i .. _ id _ _ id]
% with a variable number of [_] between each [id], and where
% - [x_i] is given by the user
% - [_] correspond to arguments that are left implicit,
% - [id] trigger unification as described in
% /Canonical Structures for the working Coq user/ by Mahboubi and Tassi
%
% phant-arg encode these three kind of arguments
% - [x_i] is encoded using [real-arg x_i]
% - [_] using [implicit-arg]
% - [id] using [unify-arg]
kind phant-arg type.
type real-arg name -> phant-arg.
type implicit-arg phant-arg.
type unify-arg phant-arg.
% phant-term is a pair of a list of argument kinds together with a term
kind phant-term type.
type phant-term list phant-arg -> term -> phant-term.
pred phant-fun i:phant-arg, i:term, i:(term -> phant-term), o:phant-term.
phant-fun Arg Ty PhF (phant-term [Arg|ArgL] (fun N Ty F)) :-
if (Arg = real-arg N) true (N = `_`),
@pi-decl N Ty x\ PhF x = phant-term ArgL (F x).
pred phant-fun-real i:name, i:term, i:(term -> phant-term), o:phant-term.
phant-fun-real N T F Res :- !, phant-fun (real-arg N) T F Res.
% [phant-fun-unify N X1 X2 PF PUF] states that PUF is a phant-term that
% is starts with unifing X1 and X2 and then outputs PF.
% N is ignored
pred phant-fun-unify i:term, i:term, i:term, i:phant-term, o:phant-term.
phant-fun-unify Msg X1 X2 (phant-term AL F) (phant-term [unify-arg|AL] UF) :-
std.assert-ok! (coq.typecheck X1 T1) "mk-phant-abbrev: X1 illtyped",
std.assert-ok! (coq.typecheck X2 T2) "mk-phant-abbrev: X2 illtyped",
UF = {{fun unif_arbitrary : lib:hb.unify lp:T1 lp:T2 lp:X1 lp:X2 lp:Msg => lp:F}}.
% [phant-fun-implicit N Ty PF PUF] states that PUF is a phant-term
% which quantifies [PF x] over [x : Ty] (with name N)
pred phant-fun-implicit i:name, i:term, i:(term -> phant-term), o:phant-term.
phant-fun-implicit N Ty PF (phant-term [implicit-arg|AL] (fun N Ty F)) :- !,
@pi-decl N Ty t\ PF t = phant-term AL (F t).
pred phant-fun-unify-mixin i:term, i:name, i:term, i:(term -> phant-term), o:phant-term.
phant-fun-unify-mixin T N Ty PF Out :- !, std.do! [
safe-dest-app Ty (global M) _,
mixin-src T M Mstr,
(@pi-decl `m` Ty m\ phant-fun-unify {{lib:hb.nomsg}} m Mstr (PF m) (PFM m)),
phant-fun-implicit N Ty PFM Out
].
% [phant-fun-struct T SI PF PSF] states that PSF is a phant-term
% which postulate a structure [s : SI] such that [T = sort s]
% and then outputs [PF s]
pred phant-fun-struct i:term, i:name, i:term, i:(term -> phant-term), o:phant-term.
phant-fun-struct T Name SI PF Out :- std.do! [
get-structure-sort-projection SI Sort,
% Msg = {{lib:hb.nomsg}},
Msg = {{lib:hb.some (lib:hb.pair "is not canonically a"%string lp:SI)}},
(@pi-decl Name SI s\ phant-fun-unify Msg T {mk-app Sort [s]} (PF s) (UnifSI s)),
phant-fun-implicit Name SI UnifSI Out
].
% [builder->term Params T Src Tgt MF] provides a term which is
% a function to transform Src into Tgt under the right mixin-src.
pred builder->term i:list term, i:term, i:factoryname, i:mixinname, o:term.
builder->term Ps T Src Tgt FT :- !, std.do! [
from Src Tgt F,
factory-requires Src MLwP,
list-w-params_list MLwP ML,
mterm->term (mterm Ps T ML F) FT].
% [instantiate-mixin T F M_i TFX] where mixin-for T M_i X_i states that
% if F ~ fun xs (m_0 : M_0 T) .. (m_n : M_n T ..) ys
% => F xs m_0 .. m_{i-1} m_i m_{i+1} .. m_n ys
% then TFX := fun xs m_0 .. m_{i-1} m_{i+1} .. m_n ys
% => F xs m_0 .. m_{i-1} X_i m_{i+1} .. m_n ys
% thus instanciating an abstraction on mixin M_i with X_i
pred instantiate-mixin i:term, i:mixinname, i:term, o:term.
instantiate-mixin T M (fun _ Tm F) R :-
safe-dest-app Tm (global TmGR) _,
factory-alias->gref TmGR M, !,
mixin-for T M X, !,
R = F X.
instantiate-mixin T M (fun N Ty F) (fun N Ty FX) :- !,
pi m\ instantiate-mixin T M (F m) (FX m).
instantiate-mixin _ _ F F.
% [mterm->term MF TFX] assumes that MF is a mterm
% (mterm ML F) and perform the substitution as above
% for every mixin-for entry out of the list ML = [M_0, .., M_n].
pred mterm->term i:mterm, o:term.
mterm->term (mterm Ps T ML F) SFX :- std.do! [
std.assert-ok! (coq.typecheck F Ty) "mterm->term: F illtyped",
mk-eta (-1) Ty F EtaF,
subst-fun {std.append Ps [T]} EtaF FT,
std.fold ML FT (instantiate-mixin T) SFX
].
% [mgref->term Params T GR X] computes the dependencies of GR in mixins,
% (through factory-requires if it exist, otherwise gr-deps)
% and instanciates all of them through mixin-src, and fails if it cannot.
pred mgref->term i:list term, i:term, i:gref, o:term.
mgref->term Ps T GR X :- factory-requires GR MLwP, !, std.do! [
list-w-params_list MLwP ML,
mterm->term (mterm Ps T ML (global GR)) X
].
mgref->term Ps T GR X :- !, std.do! [
std.assert! (gr-deps GR MLwP) "BUG: gr-deps should never fail",
list-w-params_list MLwP ML,
mterm->term (mterm Ps T ML (global GR)) X
].
% [mixin-srcs T X MSL] states that MSL is a list of [mixin-src T m X]
% where m ranges all the mixins that the factory Src can provide,
% where Src is the type of X.
pred mixin-srcs i:term, i:term, o:list prop.
mixin-srcs T X MSL :- std.do! [
std.assert-ok! (coq.typecheck X XTy) "mixin-src: X illtyped",
if (not (safe-dest-app XTy (global _) _))
(coq.error "Term:\n" {coq.term->string X}
"\nhas type:\n" {coq.term->string XTy}
"\nwhich is not a record")
true,
term->gref XTy Src,
factory-provides Src MLwP,
list-w-params_list MLwP ML,
% TODO: skip mixins for which there is already a source.
std.map ML (m\r\ r = mixin-src T m X) MSL
].
pred under-mixin-src-from-factory.then i:term, i:term, i:(term -> prop), o:term.
under-mixin-src-from-factory.then TheType TheFactory P X :- std.do![
mixin-srcs TheType TheFactory ML,
ML => P X
].
pred under-mixin-src-from-factory.do! i:term, i:term, i:list prop.
under-mixin-src-from-factory.do! TheType TheFactory LP :-
under.do! (under-mixin-src-from-factory.then TheType TheFactory) LP.
pred under-mixin-src-from-factories.then i:term, i:list term, i:(term -> prop), o:term.
under-mixin-src-from-factories.then TheType Factories P X :-
std.map Factories (mixin-srcs TheType) MLL,
std.flatten MLL ML,
ML => P X.
pred under-mixin-src-from-factories.do! i:term, i:list term, i:list prop.
under-mixin-src-from-factories.do! TheType Factories LP :-
under.do! (under-mixin-src-from-factories.then TheType Factories) LP.
% [mixin-for T M X] states that X has type [M T ...]
% it is reconstructed from two databases [mixin-src] and [from]
pred mixin-for o:term, o:mixinname, o:term.
mixin-for T M MI :- mixin-src T M Tm, !, std.do! [
std.assert-ok! (coq.typecheck Tm Ty) "mixin-for: Tm illtyped",
factory? Ty (triple Factory Params _),
if (M = Factory) (MI = Tm) (
builder->term Params T Factory M F,
subst-fun [Tm] F MI
)
].
% ----------- Finding and instantiating mixin arguments -------------------
% [ty-deps Ty ML] states that ML is the list of
% mixins which the type Ty rely on, i.e.
% Ty = forall p_1 ... p_n (T : Type) (m_0 : M_0 T) ... (m_n : M_n T ..), (zero : T), ..... axioms_ T
% ML = [M_0, .., M_n]
% pred ty-deps i:term, o:list-w-params mixinname.
% ty-deps (prod N S R) ML' :- !,
% @pi-decl N S x\
% ty-deps (R x) ML,
% safe-dest-app S HD _,
% if (HD = global GR, factory-alias->gref GR F, from _ F _, !)
% (ML' = [F|ML]) (ML' = ML).
% ty-deps Ty ML :- whd1 Ty Ty1, !, ty-deps Ty1 ML.
% ty-deps _Ty [].
pred factory? i:term, o:w-args factoryname.
factory? S (triple F Params T) :-
safe-dest-app S (global GR) Args, factory-alias->gref GR F, factory-nparams F NP, !,
std.split-at NP Args Params [T|_].
pred prod-src-is-factory i:term.
prod-src-is-factory (prod _ S _) :- factory? S _.
prod-src-is-factory Ty :- whd1 Ty Ty1, !, prod-src-is-factory Ty1.
pred ty-deps i:term, o:list-w-params mixinname.
ty-deps Ty ML :- ty-deps.aux Ty ML, !.
ty-deps (prod N T _) (w-params.nil N T _\[]) :- T = {{Type}}, !.
ty-deps T _ :- % TODO: forall p1 ... pn (T : indexed Type) with indexed being the id function
coq.error "ty-deps: BUG: could not get the parameters and the dependencies of"
{coq.term->string T}.
pred ty-deps.aux i:term, o:list-w-params mixinname.
ty-deps.aux (prod N S R) ML :- !,
@pi-decl N S x\
if (prod-src-is-factory (R x); S = {{ lib:hb.indexed Type }})
(ML = w-params.nil N S MLP, ty-deps.factories (R x) (MLP x))
(ML = w-params.cons N S ML1, ty-deps.aux (R x) (ML1 x)).
ty-deps.aux Ty ML :- whd1 Ty Ty1, !, ty-deps.aux Ty1 ML.
pred ty-deps.factories i:term, o:list (w-args factoryname).
ty-deps.factories (prod N S R) FS :-
@pi-decl N S x\
if (factory? S FwP) (FS = [FwP|FS1]) (FS = FS1),
ty-deps.factories (R x) FS1.
ty-deps.factories Ty FS :- whd1 Ty Ty1, !, ty-deps.factories Ty1 FS.
ty-deps.factories _ [].
% [term-deps T ML] states that ML is the list of
% mixins which the term T rely on, i.e. T has type
% forall (m_0 : M_0 T) ... (m_n : M_n T ..), _ and ML = [M_0, .., M_n]
pred term-deps i:term, o:list-w-params mixinname.
term-deps T ML :-
std.assert-ok! (coq.typecheck T Ty) "term-deps: T illtyped",
ty-deps Ty ML.
% shorthand for gref.
pred gr-deps i:gref, o:list-w-params mixinname.
gr-deps GR ML :- term-deps (global GR) ML.
% [find-max-classes Mixins Classes] states that Classes is a list of classes
% which contain all the mixins in Mixins.
% Although it is not strictly necessary, but desirable for debugging,
% we use a heuristic that tries to minimize the number
% of classes by assuming Mixins are reversed topologically sorted.
% Note: works with flat mixins, no params
pred find-max-classes i:list mixinname, o:list classname.
find-max-classes [] [].
find-max-classes [M|Mixins] [C|Classes] :-
mixin-first-class M C,
std.do! [
class-def (class C _ MLwP),
list-w-params_list MLwP ML,
std.filter Mixins (x\ not (std.mem! ML x)) Mixins',
find-max-classes Mixins' Classes
].
find-max-classes [M|_] _ :- coq.error "cannot find a class containing mixin" M.
pred under-mixins.then i:list (w-args mixinname),
i:(name -> term -> (term -> A) -> A -> prop),
i:(A -> prop), o:A.
under-mixins.then [] _ Pred Body :- !, Pred Body.
under-mixins.then [triple M Args T|ML] Mixin Pred Out :- std.do! [
mgref->term Args T M MTy,
(@pi-decl `m` MTy m\ mixin-src T M m =>
under-mixins.then ML Mixin Pred (Body m)),
Mixin `m` MTy Body Out
].
% [mk-mixin-fun.then MLwP Pred F] states that F has shape
% fun p_1 .. p_k T,
% (m_0 : M_0 ..p.. T) .. (m_n : M_n ..p.. T m_i0 .. m_ik) =>
% Body m_0 .. m_n
% where MLwP contains M_0, .., M_n (under p_1 .. p_k)
% and Body is such that [..,mixin-src T M_i m_i,..] => Pred Body
% and ..p.. is a list of terms built using p_1 .. p_k and T
pred mk-mixin-fun.then i:list-w-params mixinname, i:(list term -> term -> term -> prop), o:term.
mk-mixin-fun.then L P Out :- !,
w-params.then L mk-fun mk-fun
(p\ t\ ml\ under-mixins.then ml mk-fun (P p t)) Out.
% A *pack* notation can be easiliy produced from a phant-term using
% [mk-phant-abbrev N PT C], which states that C is a new constant
% which name is phant_N, and which produces a simple notation
% with name N using the data of the phant-term PT to reconstruct a notation
% [Notation N x0 .. xn := C x0 _ _ id .. xi .. _ id _ _ id]
% as described above.
pred mk-phant-abbrev.term i:int, i:term, i:list phant-arg, o:int, o:term.
mk-phant-abbrev.term K F [] K F.
mk-phant-abbrev.term K F [real-arg N|AL] K'' (fun N _ AbbrevFx) :- !,
pi x\ mk-phant-abbrev.term K {mk-app F [x]} AL K' (AbbrevFx x),
K'' is K' + 1.
mk-phant-abbrev.term K F [implicit-arg|AL] K' FAbbrev :- !,
mk-phant-abbrev.term K {mk-app F [_]} AL K' FAbbrev.
mk-phant-abbrev.term K F [unify-arg|AL] K' FAbbrev :- !,
mk-phant-abbrev.term K {mk-app F [{{lib:@hb.id _ _}}]} AL K' FAbbrev.
pred mk-phant-abbrev i:string, i:phant-term, o:constant, o:abbreviation.
mk-phant-abbrev N (phant-term AL T) C Abbrev :- std.do! [
NC is "phant_" ^ N,
std.assert-ok! (coq.typecheck T TTy) "mk-phant-abbrev: T illtyped",
coq.env.add-const NC T TTy ff ff C,
mk-phant-abbrev.term 0 (global (const C)) AL NParams AbbrevT,
add-abbrev N NParams AbbrevT tt tt Abbrev,
].
% [acc-phant-abbrev Str GR PhGR Abbrev] makes a phantom abbreviation for F
pred acc-phant-abbrev i:string, i:gref, o:gref, o:abbreviation.
acc-phant-abbrev Str GR (const PhC) Abbrev :- !, std.do! [
mk-phant-term (global GR) PhGR,
mk-phant-abbrev Str PhGR PhC Abbrev
].
% [mk-phant-term F PF] states that
% if F = fun p1 .. p_k T m_0 .. m_n => _
% then PF = phant-term
% [real-arg p_1, ... real-arg p_k, real-arg T, implicit-arg, .., implicit-arg,
% implicit-arg, .., implicit-arg,
% implicit-arg, unify-arg,
% implicit-arg, unify-arg,
% implicit-arg, .., implicit-arg, unify-arg,
% unify-arg, ..., unify-arg,
% ...,
% implicit-arg, .., implicit-arg,
% implicit-arg, unify-arg,
% implicit-arg, unify-arg,
% implicit-arg, .., implicit-arg, unify-arg,
% unify-arg, ..., unify-arg]
% {{fun p_1 ... p_k T m_0 .. m_n =>
% fun q_1 .. q_l =>
% [find s_0 | T ~ s_0]
% [find c_0 | s_0 ~ SK q_1 .. q_l T c_0]
% [find m'_{i_0_0}, .., m'_{i_0_n0} | c_0 ~ CK m'_{i_0_0} .. m'_{i_0_n0}]
% fun of hb.unify m_{i_0_0} m'_{i_0_0} & ... & hb.unify m_{i_0_n0} m'_{i_0_n0} =>
% ...
% fun q'_1 .. q'_l' =>
% [find s_k | T ~ s_k]
% [find c_k | s_k ~ SK q'_1 .. q'_l' T c_k]
% [find m'_{i_k_0}, .., m'_{i_k_nk} | c_0 ~ CK m'_{i_k_0} .. m'_{i_k_nk}]
% fun of hb.unify m_{i_0_0} m'_{i_0_0} & ... & hb.unify m_{i_k_nk} m'_{i_k_nk} =>
% F p_1 ... p_k T m_i0_j0 .. m_il_jl}}
pred mk-phant-term.mixins i:term, i:classname, i:phant-term,
i:list term, i:name, i:term, i:(term -> list (w-args mixinname)), o:phant-term.
mk-phant-term.mixins T CN PF Params N Ty MLwA Out :- std.do! [
class-def (class CN SI _),
NoMsg = {{lib:hb.nomsg}},
(@pi-decl N Ty t\ sigma SK KC ML\ std.do! [
std.map (MLwA t) triple_1 ML,
std.append Params [T] ParamsT,
SKPT = app [global {get-constructor SI} | ParamsT],
ClassTy = app [global CN | ParamsT],
(@pi-decl `s` SI s\ @pi-decl `c` ClassTy c\ sigma PF2\ std.do![
under-mixins.then (MLwA t) (phant-fun-unify-mixin T)
(x\ sigma KC KCM\ std.do![
get-constructor (global CN) KC,
mgref->term Params t KC KCM,
phant-fun-unify NoMsg KCM c PF x
]) PF2,
phant-fun-unify NoMsg s {mk-app SKPT [c]} PF2 (PFU t s c)])
]),
Out = {phant-fun-struct T `s` SI s\
{phant-fun-implicit `c` ClassTy (PFU T s)}}
].
pred mk-phant-term.class i:term, i:classname, i:phant-term, o:phant-term.
mk-phant-term.class T CN PF CPF :- !, std.do! [
class-def (class CN _ CMLwP),
w-params.fold CMLwP phant-fun-implicit (mk-phant-term.mixins T CN PF) CPF
].
pred mk-phant-term.classes i:term, i:list classname, i:list term, i:term,
i:list (w-args mixinname), o:phant-term.
mk-phant-term.classes EtaF CNF PL T MLwA PhF :- !, std.do! [
std.map MLwA triple_1 ML,
under-mixins.then MLwA phant-fun-implicit (out\ sigma FPLTM\ std.do! [
mterm->term (mterm PL T ML EtaF) FPLTM,
std.fold CNF (phant-term [] FPLTM) (mk-phant-term.class T) out]) PhF
].
pred mk-phant-term i:term, o:phant-term.
mk-phant-term F PhBody:- !, std.do! [
std.assert-ok! (coq.typecheck F FTy) "mk-phant-term: F illtyped",
ty-deps FTy MLwP,
mk-eta (-1) FTy F EtaF,
% toposort-mixins ML MLSorted,
MLwP = MLwPSorted, % Assumes we give them already sorted in dep order.
std.rev {list-w-params_list MLwPSorted} MLSortedRev,
find-max-classes MLSortedRev CNL,
w-params.then MLwP phant-fun-real phant-fun-real
(mk-phant-term.classes EtaF CNL) PhBody,
].
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% Synthesis %
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pred params->holes i:list-w-params A, o:list term.
params->holes (w-params.nil _ _ _) [].
params->holes (w-params.cons _ _ F) [_|PS] :- pi x\ params->holes (F x) PS.
% Given a type T, a list of class definition in topological order (from least dep to most)
% it consumes the list all the classes for which all the dependencies
% (mixins) were postulated so far (skips the rest) and declares a local
% constant inhabiting the corresponding structure and declares it canonical.
pred declare-instances i:term, i:list class.
declare-instances T [class Class Struct MLwP|Rest] :-
params->holes MLwP Params,
get-constructor (global Class) KC,
mgref->term Params T KC KCApp, % we can build it
not (local-cs? T Struct), % not already built
!,
term->gref T TGR,
coq.gref->id TGR TID,
Name is TID ^ "_is_a_" ^ {term->modname Struct},
if-verbose (coq.say "HB: declare canonical instance" Name),