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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open Names
open Term
open Environ
open Reductionops
open Evd
open Locus
(** {4 Unification for type inference. } *)
exception UnableToUnify of evar_map * Pretype_errors.unification_error
(** {6 Main unification algorithm for type inference. } *)
(** returns exception NotUnifiable with best known evar_map if not unifiable *)
val the_conv_x : env -> ?ts:transparent_state -> constr -> constr -> evar_map -> evar_map
val the_conv_x_leq : env -> ?ts:transparent_state -> constr -> constr -> evar_map -> evar_map
(** The same function resolving evars by side-effect and
catching the exception *)
val e_conv : env -> ?ts:transparent_state -> evar_map ref -> constr -> constr -> bool
val e_cumul : env -> ?ts:transparent_state -> evar_map ref -> constr -> constr -> bool
(** {6 Unification heuristics. } *)
(** Try heuristics to solve pending unification problems and to solve
evars with candidates *)
val consider_remaining_unif_problems : env -> ?ts:transparent_state -> evar_map -> evar_map
(** Check all pending unification problems are solved and raise an
error otherwise *)
val check_problems_are_solved : env -> evar_map -> unit
(** Check if a canonical structure is applicable *)
val check_conv_record : env -> evar_map ->
constr * types Stack.t -> constr * types Stack.t ->
Univ.universe_context_set * (constr * constr)
* constr * constr list * (constr Stack.t * constr Stack.t) *
(constr Stack.t * types Stack.t) *
(constr Stack.t * types Stack.t) * constr *
(int option * constr)
(** Try to solve problems of the form ?x[args] = c by second-order
matching, using typing to select occurrences *)
val second_order_matching : transparent_state -> env -> evar_map ->
existential -> occurrences option list -> constr -> evar_map * bool
(** Declare function to enforce evars resolution by using typing constraints *)
val set_solve_evars : (env -> evar_map ref -> constr -> constr) -> unit
type unify_fun = transparent_state ->
env -> evar_map -> conv_pb -> constr -> constr -> Evarsolve.unification_result
(** Override default [evar_conv_x] algorithm. *)
val set_evar_conv : unify_fun -> unit
(** The default unification algorithm with evars and universes. *)
val evar_conv_x : unify_fun
(**/**)
(* For debugging *)
val evar_eqappr_x : ?rhs_is_already_stuck:bool -> transparent_state * bool ->
env -> evar_map ->
conv_pb -> state * Cst_stack.t -> state * Cst_stack.t ->
Evarsolve.unification_result
(**/**)
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