(*
 * Environments used during dependency analysis.
 *
 * (C) 1999 Lucent Technologies, Bell Laboratories
 *
 * Author: Matthias Blume (blume@kurims.kyoto-u.ac.jp)
 *)
structure DAEnv = struct

    datatype env =
	EMPTY
      | FCTENV of Symbol.symbol -> value option
      | BINDING of Symbol.symbol * value
      | LAYER of env * env
      | FILTER of SymbolSet.set * env

    withtype value = env
end

<script type="text/javascript">//<![CDATA[
		function toggle_ffErrors() {
			var errorsblock = document.getElementById("ffErrorsBlock");
			var errorsgroup = document.getElementById("ffErrors");
			if (errorsblock.style.display == "none") {
				errorsblock.style.display = "block";
				errorsgroup.style.right = "10px";
			} else {
				errorsblock.style.display = "none";
				errorsgroup.style.right = "300px";
			}
		}
//]]></script>
<div id="ffErrors">
<a href="javascript:toggle_ffErrors();">Click to toggle</a>
<div id="ffErrorsBlock">
	<div class="error">does not end with &lt;/html&gt; tag</div>
	<div class="error">does not end with &lt;/body&gt; tag</div>
	<div class="info">The output has ended thus: value
      | LAYER of env * env
      | FILTER of SymbolSet.set * env

    withtype value = env
end</div>
</div></div>
</body></html>