Paste # 9166: bsl num->string error

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Paste # 9166
2014-04-14 15:47:28
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<link type="text/css" rel="stylesheet" href="http://pasterack.org/scribble.css"/><link type="text/css" rel="stylesheet" href="http://pasterack.org/racket.css"/><link type="text/css" rel="stylesheet" href="http://fonts.googleapis.com/css?family=Droid+Sans+Mono"/><div style="font-family:'Droid Sans Mono',monospace;background-color:transparent"><ol start="0" style="font-size:70%;color:#A0A0A0"><li><span style="font-family:'Droid Sans Mono',monospace;font-size:125%"><span class="RktMeta">#lang</span><span class="hspace"> </span><span class="RktMeta"></span><font class="badlink"><span class="RktModLink"><span class="RktSym">htdp/bsl</span></span></font><span class="RktMeta"></span></span></li><li><span style="font-family:'Droid Sans Mono',monospace;font-size:125%"><span class="RktMeta"></span><span class="RktPn">(</span><span class="RktSym"><a class="RktValLink" data-pltdoc="x" href="http://docs.racket-lang.org/htdp-langs/beginner.html#%28def._htdp-beginner._%28%28lib._lang%2Fhtdp-beginner..rkt%29._number-~3estring%29%29">number->string</a></span><span class="RktMeta"></span><span class="hspace"> </span><span class="RktMeta"></span><span class="RktVal">"asdf"</span><span class="RktPn">)</span><span class="RktMeta"></span></span></li></ol><p>=></p><blockquote><table style="font-size:90%;table-layout:fixed;width:100%;word-wrap:break-word"><tr><td><p><span class="RktErr">number->string: contract violation</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace">  </span><span class="RktErr">expected: number?</span></p></td></tr><tr><td><p><span class="RktErr"></span><span class="hspace">  </span><span class="RktErr">given: "asdf"</span></p></td></tr></table></blockquote></div>