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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id$ i*)
(*i*)
open Names
open Decl_kinds
open Term
open Sign
open Evd
open Environ
open Nametab
open Mod_subst
open Topconstr
open Util
open Libnames
(*i*)
type contexts = Parameters | Properties
type typeclass_error =
| NotAClass of constr
| UnboundMethod of global_reference * identifier located (* Class name, method *)
| NoInstance of identifier located * constr list
| UnsatisfiableConstraints of evar_defs * (evar_info * hole_kind) option
| MismatchedContextInstance of contexts * constr_expr list * rel_context (* found, expected *)
exception TypeClassError of env * typeclass_error
let typeclass_error env err = raise (TypeClassError (env, err))
let not_a_class env c = typeclass_error env (NotAClass c)
let unbound_method env cid id = typeclass_error env (UnboundMethod (cid, id))
let no_instance env id args = typeclass_error env (NoInstance (id, args))
let unsatisfiable_constraints env evd ev =
let evd = Evd.undefined_evars evd in
match ev with
| None ->
raise (TypeClassError (env, UnsatisfiableConstraints (evd, None)))
| Some ev ->
let evi = Evd.find ( evd) ev in
let loc, kind = Evd.evar_source ev evd in
raise (Stdpp.Exc_located (loc, TypeClassError
(env, UnsatisfiableConstraints (evd, Some (evi, kind)))))
let mismatched_ctx_inst env c n m = typeclass_error env (MismatchedContextInstance (c, n, m))
let rec unsatisfiable_exception exn =
match exn with
| TypeClassError (_, UnsatisfiableConstraints _) -> true
| Stdpp.Exc_located(_, e) -> unsatisfiable_exception e
| _ -> false
|
