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+-- Copyright (C) 2011, Gabriel Dos Reis.
+-- All rights reserved.
+--
+-- Redistribution and use in source and binary forms, with or without
+-- modification, are permitted provided that the following conditions are
+-- met:
+--
+--     - Redistributions of source code must retain the above copyright
+--       notice, this list of conditions and the following disclaimer.
+--
+--     - Redistributions in binary form must reproduce the above copyright
+--       notice, this list of conditions and the following disclaimer in
+--       the documentation and/or other materials provided with the
+--       distribution.
+--
+--     - Neither the name of The Numerical Algorithms Group Ltd. nor the
+--       names of its contributors may be used to endorse or promote products
+--       derived from this software without specific prior written permission.
+--
+-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+-- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+-- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+-- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+-- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+-- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+--
+
+import initial_-env
+namespace BOOTTRAN
+module utility (objectMember?, symbolMember?, stringMember?,
+  charMember?, scalarMember?)
+
+objectMember?(x,l) ==
+  cons? l => sameObject?(x,first l) or objectMember?(x,rest l)
+  sameObject?(x,l)
+
+symbolMember?(x,l) ==
+  l = nil => false
+  cons? l => sameObject?(x,first l) or symbolMember?(x,rest l)
+  sameObject?(x,l)
+
+stringMember?(s,l) ==
+  l = nil => false
+  cons? l => stringEq?(s,first l) or stringMember?(s,rest l)
+  stringEq?(s,l)
+
+charMember?(x,l) ==
+  l = nil => false
+  cons? l => charEq?(x,first l) or charMember?(x,rest l)
+  charEq?(x,l)
+
+scalarMember?(x,l) ==
+  l = nil => false
+  cons? l => scalarEq?(x,first l) or scalarMember?(x,rest l)
+  scalarEq?(x,l)
+
+