Apologies for the inaccurate comment, without completely researching the "Trace trees" logic. Indeed, it is not apparent that Perl or other common languages use it or have used it for long.<br><br>
<div><span class="gmail_quote">On 8/24/08, <b class="gmail_sendername">Fredrik Lundh</b> <<a href="mailto:fredrik@pythonware.com">fredrik@pythonware.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><span class="q">Banibrata Dutta wrote:<br><br>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">AFAIK, the same logic used in runtime optimization of several other dynamic languages or shell-scripting languages (including Perl), for quite a while.<br>
</blockquote><br></span>Trace trees are widely used?  Got any references for that?<br><span class="sg"><br></F></span> 
<div><span class="e" id="q_11bf38e734f21c86_3"><br><br>--<br><a onclick="return top.js.OpenExtLink(window,event,this)" href="http://mail.python.org/mailman/listinfo/python-list" target="_blank">http://mail.python.org/mailman/listinfo/python-list</a><br>
</span></div></blockquote></div><br><br clear="all"><br>-- <br>regards,<br>Banibrata<br><a href="http://www.linkedin.com/in/bdutta">http://www.linkedin.com/in/bdutta</a><br><a href="http://octapod.wordpress.com">http://octapod.wordpress.com</a>