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(* (c) Copyright Microsoft Corporation and Inria. All rights reserved. *)
Require ssreflect.
Require Import Arith.
Goal (forall a b, a + b = b + a).
intros.
rewrite plus_comm, plus_comm.
split.
Abort.
Module Foo.
Import ssreflect.
Goal (forall a b, a + b = b + a).
intros.
rewrite 2![_ + _]plus_comm.
split.
Abort.
End Foo.
Goal (forall a b, a + b = b + a).
intros.
rewrite plus_comm, plus_comm.
split.
Abort.
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