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(*         *   The Coq Proof Assistant / The Coq Development Team       *)
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(* (c) Copyright 2006-2016 Microsoft Corporation and Inria.                  *)
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.