<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
<tt>I skipped ahead to Chapter 6 in HtDP but that chapter did not
specify which teachpack contained (make-posn). Loading the draw
teachpack worked for </tt><code class="scheme"><br>
<br>
<br>
(<span class="variable">start</span> <span class="selfeval">300</span>
<span class="selfeval">300</span>)</code> ; which opens a canvas;
<p><font face="Arial Black"><code class="scheme"><font
face="Times New Roman, Times, serif">but failed for:</font><br>
</code></font></p>
<p><code class="scheme">(<span class="variable">draw-solid-line</span> (<span
class="builtin">make-posn</span> <span class="selfeval">10</span> <span
class="selfeval">10</span>) (<span class="builtin">make-posn</span> <span
class="selfeval">110</span> <span class="selfeval">10</span>) <span
class="keyword">'</span><span class="variable">red)<br>
</span></code></p>
<p><code class="scheme"><span class="variable"><font
face="Times New Roman, Times, serif">because make-posn was undefined.</font><br>
<br>
</span></code></p>
</body>
</html>