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(*         *   The Coq Proof Assistant / The Coq Development Team       *)
(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
(* <O___,, *       (see CREDITS file for the list of authors)           *)
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(* (c) Copyright 2006-2016 Microsoft Corporation and Inria.                  *)
move=> y x le_1 defx; rewrite insubT ?(leq_trans le_1) // => ?.
by congr (Some _); apply: val_inj=> /=; exact: defx.
Qed.
Definition R := fun (x : nat) (p : P x) m (q : P (x+1)) => m > 0.
Inductive myEx : Type := ExI : forall n (pn : P n) pn', Q n pn -> R n pn n pn' -> myEx.
Variable P1 : P 1.
Variable P11 : P (1 + 1).
Variable Q1 : forall P1, Q 1 P1.

Lemma testE3 : exists y : { x | P x }, sval y = 1.