(* (c) Copyright 2006-2015 Microsoft Corporation and Inria.                  *)
(* Distributed under the terms of CeCILL-B.                                  *)
Require Import mathcomp.ssrtest.ssrsyntax1.
Require Import Arith.

Goal (forall a b, a + b = b + a).
intros.
rewrite plus_comm, plus_comm.
split.
Qed.