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+.\" Copyright (C) Caldera International Inc. 2001-2002.  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 and documentation 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.
+.\" 
+.\" All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" 
+.\" This product includes software developed or owned by Caldera
+.\" International, Inc.  Neither the name of Caldera International, Inc.
+.\" nor the names of other contributors may be used to endorse or promote
+.\" products derived from this software without specific prior written
+.\" permission.
+.\" 
+.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
+.\" INTERNATIONAL, INC.  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 CALDERA INTERNATIONAL, INC. BE LIABLE
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+.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+.\" OR OTHERWISE) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.SH
+Appendix D: Old Features Supported but not Encouraged
+.PP
+This Appendix mentions synonyms and features which are supported for historical
+continuity, but, for various reasons, are not encouraged.
+.IP 1.
+Literals may also be delimited by double quotes ``"''.
+.IP 2.
+Literals may be more than one character long.
+If all the characters are alphabetic, numeric, or \_, the type number of the literal is defined,
+just as if the literal did not have the quotes around it.
+Otherwise, it is difficult to find the value for such literals.
+.IP
+The use of multi-character literals is likely to mislead those unfamiliar with
+Yacc, since it suggests that Yacc is doing a job which must be actually done by the lexical analyzer.
+.IP 3.
+Most places where % is legal, backslash ``\e'' may be used.
+In particular, \e\e is the same as %%, \eleft the same as %left, etc.
+.IP 4.
+There are a number of other synonyms:
+.DS
+%< is the same as %left
+%> is the same as %right
+%binary and %2 are the same as %nonassoc
+%0 and %term are the same as %token
+%= is the same as %prec
+.DE
+.IP 5.
+Actions may also have the form
+.DS
+={ . . . }
+.DE
+and the curly braces can be dropped if the action is a
+single C statement.
+.IP 6.
+C code between %{ and %} used to be permitted at the
+head of the rules section, as well as in the
+declaration section.