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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 ssrfun ssrbool TestSuite.ssr_mini_mathcomp.
+
+Set Implicit Arguments.
+Unset Strict Implicit.
+Import Prenex Implicits.
+
+Lemma test0 (a b : unit) f : a = f b.
+Proof. by rewrite !unitE. Qed.
+
+Lemma phE T : all_equal_to (Phant T). Proof. by case. Qed.
+
+Lemma test1 (a b : phant nat) f : a = f b.
+Proof. by rewrite !phE. Qed.
+
+Lemma eq_phE (T : eqType) : all_equal_to (Phant T). Proof. by case. Qed.
+
+Lemma test2 (a b : phant bool) f : a = locked (f b).
+Proof. by rewrite !eq_phE. Qed.