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(*         *   The Coq Proof Assistant / The Coq Development Team       *)
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Notation "( a 'in' c )" := (a + c) (only parsing) : myscope.
Delimit Scope myscope with myscope.
Notation "( a 'in' c )" := (a + c) (only parsing).
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.