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To aid in the debugging of code produced by program generators such as <a class="external" href="http://www.eecs.harvard.edu/~nr/noweb/"><img src="moin-www.png" alt="[WWW]" height="11" width="11">Noweb</a>, MLton supports comments with line directives of the form <tt> (*#line </tt><em>line</em><tt>.</tt><em>col</em><tt> "</tt><em>file</em><tt>"*)</tt>. Here, <em>line</em> and <em>col</em> are sequences of decimal digits and <em>file</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 <tt>MLton.Exn.history</tt> 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 <tt>*)</tt>. </div>
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Last edited on 2007-11-07 19:07:39 by <span title="cs27019070.pp.htv.fi"><a href="VesaKarvonen">VesaKarvonen</a></span>.
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