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

Require Import ssreflect.
Require Import ssrbool TestSuite.ssr_mini_mathcomp.

Set Implicit Arguments.
Unset Strict Implicit.
Import Prenex Implicits.

(* error 1 *)

Ltac subst1 H := move: H; rewrite {1} addnC; move => H.
Ltac subst2 H := rewrite addnC in H.

Goal ( forall a b: nat, b+a = 0 -> b+a=0).
Proof. move=> a b hyp. subst1 hyp. subst2 hyp. done. Qed.