<!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta name="generator" content="AsciiDoc 8.6.8"> <title>LineDirective</title> <link rel="stylesheet" href="./asciidoc.css" type="text/css"> <link rel="stylesheet" href="./pygments.css" type="text/css"> <script type="text/javascript" src="./asciidoc.js"></script> <script type="text/javascript"> /*<![CDATA[*/ asciidoc.install(); /*]]>*/ </script> <link rel="stylesheet" href="./mlton.css" type="text/css"/> </head> <body class="article"> <div id="banner"> <div id="banner-home"> <a href="./Home">MLton 20130715</a> </div> </div> <div id="header"> <h1>LineDirective</h1> </div> <div id="content"> <div id="preamble"> <div class="sectionbody"> <div class="paragraph"><p>To aid in the debugging of code produced by program generators such as <a href="http://www.eecs.harvard.edu/%7Enr/noweb/">Noweb</a>, MLton supports comments with line directives of the form</p></div> <div class="listingblock"> <div class="content"><div class="highlight"><pre><span class="cm">(*#line l.c "f"*)</span><span class="w"></span> </pre></div></div></div> <div class="paragraph"><p>Here, <em>l</em> and <em>c</em> are sequences of decimal digits and <em>f</em> is the source file. The first character of a source file has the position 1.1. A line directive causes the front end to believe that the character following the right parenthesis is at the line and column of the specified file. A line directive only affects the reporting of error messages and does not affect program semantics (except for functions like <span class="monospaced">MLton.Exn.history</span> that report source file positions). Syntactically invalid line directives are ignored. To prevent incompatibilities with SML, the file name may not contain the character sequence <span class="monospaced">*)</span>.</p></div> </div> </div> </div> <div id="footnotes"><hr></div> <div id="footer"> <div id="footer-text"> </div> <div id="footer-badges"> </div> </div> </body> </html>
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