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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) *)
+(* \VV/ **************************************************************)
+(* // * This file is distributed under the terms of the *)
+(* * GNU Lesser General Public License Version 2.1 *)
+(* * (see LICENSE file for the text of the license) *)
+(************************************************************************)
+
+(* (c) Copyright 2006-2016 Microsoft Corporation and Inria. *)
+
+Require Import ssreflect.
+Require Import ssrbool TestSuite.ssr_mini_mathcomp.
+
+Notation "( a 'in' c )" := (a + c) (only parsing) : myscope.
+Delimit Scope myscope with myscope.
+
+Notation "( a 'in' c )" := (a + c) (only parsing).
+
+Lemma foo x y : x + x.+1 = x.+1 + y.
+move: {x} (x.+1) {1}x y (x.+1 in RHS).
+ match goal with |- forall a b c d, b + a = d + c => idtac end.
+Admitted.
+
+Lemma bar x y : x + x.+1 = x.+1 + y.
+move E: ((x.+1 in y)) => w.
+ match goal with |- x + x.+1 = w => rewrite -{w}E end.
+move E: (x.+1 in y)%myscope => w.
+ match goal with |- x + x.+1 = w => rewrite -{w}E end.
+move E: ((x + y).+1 as RHS) => w.
+ match goal with |- x + x.+1 = w => rewrite -{}E -addSn end.
+Admitted.