[ssr] import ssreflect test suite from math-comp

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diff --git a/test-suite/ssr/deferclear.v b/test-suite/ssr/deferclear.v
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+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+(* (c) Copyright 2006-2016 Microsoft Corporation and Inria.                  *)
+
+Require Import ssreflect.
+
+Require Import ssrbool TestSuite.ssr_mini_mathcomp.
+
+Variable T : Type.
+
+Lemma test0 : forall a b c d : T, True.
+Proof. by move=> a b {a} a c; exact I. Qed.
+
+Variable P : T -> Prop.
+
+Lemma test1 : forall a b c : T, P a -> forall d : T, True.
+Proof. move=> a b {a} a _ d; exact I. Qed.
+
+Definition Q := forall x y : nat, x = y.
+Axiom L : 0 = 0 -> Q.
+Axiom L' : 0 = 0 -> forall x y : nat, x = y.
+Lemma test3 : Q.
+by apply/L.
+Undo.
+rewrite /Q.
+by apply/L.
+Undo 2.
+by apply/L'.
+Qed.