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diff --git a/test/lisp/legacy/lexbind-tests.el b/test/lisp/legacy/lexbind-tests.el
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+;;; lexbind-tests.el --- Testing the lexbind byte-compiler
+
+;; Copyright (C) 2011-2015 Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+;; Keywords:
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;
+
+;;; Code:
+
+(require 'ert)
+
+(defconst lexbind-tests
+  `(
+    (let ((f #'car))
+      (let ((f (lambda (x) (cons (funcall f x) (cdr x)))))
+        (funcall f '(1 . 2))))
+    )
+  "List of expression for test.
+Each element will be executed by interpreter and with
+bytecompiled code, and their results compared.")
+
+
+
+(defun lexbind-check-1 (pat)
+  "Return non-nil if PAT is the same whether directly evalled or compiled."
+  (let ((warning-minimum-log-level :emergency)
+	(byte-compile-warnings nil)
+	(v0 (condition-case nil
+		(eval pat t)
+	      (error nil)))
+	(v1 (condition-case nil
+		(funcall (let ((lexical-binding t))
+                           (byte-compile `(lambda nil ,pat))))
+	      (error nil))))
+    (equal v0 v1)))
+
+(put 'lexbind-check-1 'ert-explainer 'lexbind-explain-1)
+
+(defun lexbind-explain-1 (pat)
+  (let ((v0 (condition-case nil
+		(eval pat t)
+	      (error nil)))
+	(v1 (condition-case nil
+		(funcall (let ((lexical-binding t))
+                           (byte-compile (list 'lambda nil pat))))
+	      (error nil))))
+    (format "Expression `%s' gives `%s' if directly evalled, `%s' if compiled."
+	    pat v0 v1)))
+
+(ert-deftest lexbind-tests ()
+  "Test the Emacs byte compiler lexbind handling."
+  (dolist (pat lexbind-tests)
+    (should (lexbind-check-1 pat))))
+
+
+
+(provide 'lexbind-tests)
+;;; lexbind-tests.el ends here