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(* (c) Copyright 2006-2016 Microsoft Corporation and Inria. *)
(* Distributed under the terms of CeCILL-B. *)
From Coq Require Export ssreflect.
Global Set SsrOldRewriteGoalsOrder.
Global Set Asymmetric Patterns.
Global Set Bullet Behavior "None".
(******************************************************************************)
(* Local additions: *)
(* nonPropType == an interface for non-Prop Types: a nonPropType coerces *)
(* to a Type, and only types that do _not_ have sort *)
(* Prop are canonical nonPropType instances. This is *)
(* useful for applied views. *)
(* --> This will become standard with the Coq v8.11 SSReflect core library. *)
(* deprecate old new == new, but warning that old is deprecated and new *)
(* should be used instead. *)
(* --> Usage: Notation old := (deprecate old new) (only parsing). *)
(* --> Caveat: deprecate old new only inherits new's maximal implicits; *)
(* on-demand implicits should be added after : (deprecate old new _). *)
(* --> Caveat 2: if premises or conclusions need to be adjusted, of for *)
(* non-prenex implicits, use the idiom: *)
(* Notation old := ((fun a1 a2 ... => deprecate old new a1 a2 ...) *)
(* _ _ ... _) (only printing). *)
(* where all the implicit a_i's occur first, and correspond to the *)
(* trailing _'s, making sure deprecate old new is fully applied and *)
(* there are _no implicits_ inside the (fun .. => ..) expression. This *)
(* is to avoid triggering a bug in SSReflect elaboration that is *)
(* triggered by such evars under binders. *)
(* Import Deprecation.Silent :: turn off deprecation warning messages. *)
(* Import Deprecation.Reject :: raise an error instead of only warning. *)
(******************************************************************************)
Module NonPropType.
Structure call_of (condition : unit) (result : bool) := Call {callee : Type}.
Definition maybeProp (T : Type) := tt.
Definition call T := Call (maybeProp T) false T.
Structure test_of (result : bool) := Test {condition :> unit}.
Definition test_Prop (P : Prop) := Test true (maybeProp P).
Definition test_negative := Test false tt.
Structure type :=
Check {result : bool; test : test_of result; frame : call_of test result}.
Definition check result test frame := @Check result test frame.
Module Exports.
Canonical call.
Canonical test_Prop.
Canonical test_negative.
Canonical check.
Notation nonPropType := type.
Coercion callee : call_of >-> Sortclass.
Coercion frame : type >-> call_of.
Notation notProp T := (@check false test_negative (call T)).
End Exports.
End NonPropType.
Export NonPropType.Exports.
Module Deprecation.
Definition hidden (T : Type) := T.
Definition exposed (T : Type) & unit -> unit -> unit := T.
Definition hide T u (v : exposed T u) : hidden T := v.
Ltac warn old_id new_id :=
idtac "Warning:" old_id "is deprecated; use" new_id "instead".
Ltac stop old_id new_id :=
fail 1 "Error:" old_id "is deprecated; use" new_id "instead".
Structure hinted := Hint {statement; hint : statement}.
Ltac check cond := let test := constr:(hint _ : cond) in idtac.
Variant reject := Reject.
Definition reject_hint := Hint reject Reject.
Module Reject. Canonical reject_hint. End Reject.
Variant silent := Silent.
Definition silent_hint := Hint silent Silent.
Module Silent. Canonical silent_hint. End Silent.
Ltac flag old_id new_id :=
first [check reject; stop old_id new_id | check silent | warn old_id new_id].
Module Exports.
Arguments hide {T} u v /.
Coercion hide : exposed >-> hidden.
Notation deprecate old_id new_id :=
(hide (fun old_id new_id => ltac:(flag old_id new_id; exact tt)) new_id)
(only parsing).
End Exports.
End Deprecation.
Export Deprecation.Exports.
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