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+%%% ====================================================================
+%%% @LaTeX-file{
+%%%   filename  = "amsxtra.dtx",
+%%%   version   = "1.2c",
+%%%   date      = "1999/11/15",
+%%%   time      = "14:15:41 EST",
+%%%   author    = "American Mathematical Society",
+%%%   copyright = "Copyright 1995, 1999 American Mathematical Society,
+%%%                all rights reserved.  Copying of this file is
+%%%                authorized only if either:
+%%%                (1) you make absolutely no changes to your copy,
+%%%                including name; OR
+%%%                (2) if you do make changes, you first rename it
+%%%                to some other name.",
+%%%   address   = "American Mathematical Society,
+%%%                Technical Support,
+%%%                Electronic Products and Services,
+%%%                P. O. Box 6248,
+%%%                Providence, RI 02940,
+%%%                USA",
+%%%   telephone = "401-455-4080 or (in the USA and Canada)
+%%%                800-321-4AMS (321-4267)",
+%%%   FAX       = "401-331-3842",
+%%%   checksum  = "41382 136 533 5124",
+%%%   email     = "tech-support@ams.org (Internet)",
+%%%   codetable = "ISO/ASCII",
+%%%   keywords  = "latex, accentedsymbol, fracwithdelims, sphat",
+%%%   supported = "yes",
+%%%   abstract  = "This package contains some seldom-used commands
+%%%                ported from AMS-TeX in 1989.",
+%%%   docstring = "The checksum field above contains a CRC-16
+%%%                checksum as the first value, followed by the
+%%%                equivalent of the standard UNIX wc (word
+%%%                count) utility output of lines, words, and
+%%%                characters.  This is produced by Robert
+%%%                Solovay's checksum utility.",
+%%% }
+%%% ====================================================================
+%\iffalse
+%<*driver>
+\documentclass{amsdtx}
+\begin{document}
+\title{The \pkg{amsxtra} package}
+\author{American Mathematical Society\\Michael Downes}
+\date{Version \fileversion, \filedate}
+\hDocInput{amsxtra.dtx}
+\end{document}
+%</driver>
+%\fi
+%
+% \maketitle
+%
+% \MakeShortVerb\|
+%
+% \section{Introduction}
+%    The \pkg{amsxtra} package contains a few rarely used commands that
+%    were present in version 1.1 of the \pkg{amstex} package:
+%    \cn{fracwithdelims}, {accentedsymbol}, \cn{sphat}, \cn{spcheck},
+%    \cn{sptilde}, \cn{spdot}, \cn{spddot}, \cn{spdddot}, \cn{spbreve}.
+%    If any of these commands were used in existing documents, the
+%    \pkg{amsxtra} package provides a way to get them. But for 99\% of
+%    documents using the \pkg{amstex} package these commands are just
+%    wasted overhead.
+%
+% \StopEventually{}
+%
+%    \begin{macrocode}
+\ProvidesPackage{amsxtra}[1999/11/15 v1.2c]
+%    \end{macrocode}
+%    We need to ensure that either the \pkg{amstex} package or the
+%    \pkg{amsmath} package is loaded. This means we need something a
+%    little more complicated than \cn{RequirePackage}.
+%    \begin{macrocode}
+\@ifpackageloaded{amstex}{}{%
+  \RequirePackage{amsmath}[1996/10/01 v1.2]}
+%    \end{macrocode}
+%
+%    Superscripted accent characters.
+%    \begin{macrocode}
+\def\sphat{^{\mathchoice{}{}%
+ {\,\,\smash[b]{\hbox{\lower4\ex@\hbox{$\m@th\widehat{\null}$}}}}%
+ {\,\smash[b]{\hbox{\lower3\ex@\hbox{$\m@th\hat{\null}$}}}}}}
+\def\spcheck{^\vee}
+\def\sptilde{^\sim}
+\def\spdot{^{\hbox{\raise\ex@\hbox{\normalfont .}}}}
+\def\spddot{^{\hbox{\raise\ex@\hbox{\normalfont ..}}}}
+\def\spdddot{^{\hbox{\raise\ex@\hbox{\normalfont...}}}}
+\def\spbreve{^{\!\smash[b]{\hbox{\lower4\ex@\hbox{\u{}}}}}}
+%    \end{macrocode}
+%
+%    The \cn{fracwithdelims} command is skipped if the base package is
+%    \pkg{amsmath}; it is only needed if the base package is
+%    \pkg{amstex}.
+%    \begin{macrocode}
+\@ifpackageloaded{amstex}{%
+\def\fracwithdelims#1#2{\new@ifnextchar[{\fracwithdelims@#1#2}%
+  {\fracwithdelims@#1#2[\@empty]}}
+\def\fracwithdelims@#1#2[#3]#4#5{\relax
+  \ifx\@empty#3{#4\overwithdelims#1#2#5}\else
+  {#4\abovewithdelims#1#2#3\relax#5}\fi}
+}{}
+%    \end{macrocode}
+%
+%    Perhaps |\accentedsymbol| should use |\newsavebox|, but I don't
+%    know of any compelling reason at the moment.[mjd,5-Sep-1994]
+%    |\accentedsymbol| can only produce a single size of
+%    the given symbol, so you'd need two different versions for main
+%    size and subscript size.
+%    \begin{macrocode}
+\def\accentedsymbol#1#2{%
+  \expandafter\newbox
+    \csname\expandafter\@gobble\string#1@box\endcsname
+  \expandafter\setbox
+    \csname\expandafter\@gobble\string#1@box\endcsname
+      \hbox{$\m@th#2$}%
+  \newcommand{#1}{%
+    \expandafter\copy
+      \csname\expandafter\@gobble\string#1@box\endcsname{}}%
+}
+%    \end{macrocode}
+%
+%    Change the definition of \qc{\~} to automatically remove a
+%    preceding space as well as a following space, if present.
+%    \begin{macrocode}
+\def~{\nobreakspace}
+\DeclareRobustCommand{\nobreakspace}{\unskip\nobreak\ \ignorespaces}
+%    \end{macrocode}
+%
+%    The usual \cs{endinput} to ensure that random garbage at the end of
+%    the file doesn't get copied by \fn{docstrip}.
+%    \begin{macrocode}
+\endinput
+%    \end{macrocode}
+%
+% \CheckSum{113}
+% \Finale