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2 lines
23 KiB
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5 years ago
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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><meta name="viewport" content="width=device-width, initial-scale=0.8"/><title>Top</title><link rel="stylesheet" type="text/css" href="scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="racket.css" title="default"/><link rel="stylesheet" type="text/css" href="manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="manual-racket.css" title="default"/><script type="text/javascript" src="scribble-common.js"></script><script type="text/javascript" src="manual-racket.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="scribble-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;">•</td><td></td><td><a href="file:///Users/MB/git/pollen/pollen/scribblings/top.html" class="tocviewselflink" data-pltdoc="x">Top</a></td></tr></table></div></div></div><div class="tocsub"><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._.Top%29" class="tocsubseclink" data-pltdoc="x">Top</a></td></tr><tr><td><a href="#%28form._%28%28lib._pollen%2Ftop..rkt%29._~23~25top%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym"><span class="badlink"><span class="RktValLink">#%top</span></span></span></a></td></tr><tr><td><a href="#%28form._%28%28lib._pollen%2Ftop..rkt%29._def%2Fc%29%29" class="tocsubnonseclink" data-pltdoc="x"><span class="RktSym">def/<span class="mywbr"> </span>c</span></a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="versionNoNav">7.1.0.6</span></div><h2><a name="(part._.Top)"></a><a name="(mod-path._pollen/top)"></a>Top</h2><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><span class="badlink"><span class="RktValLink">require</span></span></span><span class="stt"> </span><a href="file:///Users/MB/git/pollen/pollen/scribblings/top.html" class="RktModLink" data-pltdoc="x"><span class="RktSym">pollen/top</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <a href="https://pkgs.racket-lang.org/package/pollen" title="Install this package using `raco pkg install pollen`"><span class="stt">pollen</span></a></span></td></tr></table></p><p>You’ll probably never invoke this module directly. But it’s implicitly imported into every Pollen markup file. And if you don’t know what it does, you might end up surprised by some of the behavior you get.</p><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>syntax</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(form._((lib._pollen/top..rkt)._~23~25top))"></a><span title="Provided from: pollen/top | Package: pollen"><span class="RktSym"><span class="badlink"><span class="RktValLink">#%top</span></span></span></span><span class="hspace"> </span><span class="RktPn">. </span><span class="RktVar">id</span><span class="RktPn">)</span></p></blockquote></td></tr></table></blockquote></div><div class="SIntrapara">In standard Racket, <span class="RktSym"><span class="badlink"><span class="RktValLink">#%top</span></span></span> is the function of last resort, called when <span class="RktVar">id</span> is not bound to any value. As such, it typically reports a syntax error.</div></p><p><div class="SIntrapara">Examples:</div><div class="SIntrapara"><blockquote class="SCodeFlow"><table cellspacing="0" cellpadding="0" class="RktBlk"><tr><td><span class="RktCmt">;</span><span class="RktCmt"> </span><span class="RktCmt">Let<
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