1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i*)
open Names
open Term
open Context
open Evd
open Environ
open Constrexpr
open Globnames
(*i*)
type contexts = Parameters | Properties
type typeclass_error =
| NotAClass of constr
| UnboundMethod of global_reference * Id.t Loc.located (* Class name, method *)
| NoInstance of Id.t Loc.located * constr list
| UnsatisfiableConstraints of
evar_map * (existential_key * Evar_kinds.t) option * Evar.Set.t 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 comp =
match ev with
| None ->
let err = UnsatisfiableConstraints (evd, None, comp) in
raise (TypeClassError (env, err))
| Some ev ->
let loc, kind = Evd.evar_source ev evd in
let err = UnsatisfiableConstraints (evd, Some (ev, kind), comp) in
Loc.raise loc (TypeClassError (env, err))
let mismatched_ctx_inst env c n m = typeclass_error env (MismatchedContextInstance (c, n, m))
let unsatisfiable_exception exn =
match exn with
| TypeClassError (_, UnsatisfiableConstraints _) -> true
| _ -> false
|