Add unit test to confirm that shadowing fix worked.

diff --git a/tests/microcode/test-lookup.scm b/tests/microcode/test-lookup.scm
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+#| -*-Scheme-*-
+
+Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+    2006, 2007, 2008, 2009, 2010 Massachusetts Institute of Technology
+
+This file is part of MIT/GNU Scheme.
+
+MIT/GNU Scheme 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 2 of the License, or (at
+your option) any later version.
+
+MIT/GNU Scheme 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 MIT/GNU Scheme; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
+USA.
+
+|#
+
+;;;; Test of character-set abstraction
+
+(declare (usual-integrations))
+\f
+(define-test 'test-interpreted-shadowing
+  (lambda ()
+    (run-shadowing-test identity-procedure)))
+
+(define-test 'test-compiled-shadowing
+  (lambda ()
+    (run-shadowing-test compile-scode)))
+
+(define (run-shadowing-test maybe-compile)
+  (let ((root (make-top-level-environment)))
+    (let ((child (extend-top-level-environment root)))
+      (environment-define root 'foo 3)
+      (link-variables root 'bar root 'foo)
+      (eval (maybe-compile
+            (syntax&integrate '(begin
+                                 (define (get-foo) foo)
+                                 (define (get-bar) bar))
+                              '((usual-integrations))
+                              child))
+           child)
+      (environment-define child 'bar 4)
+      (assert-eqv (eval '(get-foo) child) 3)
+      (assert-eqv (eval '(get-bar) child) 4))))
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