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a function to refill the buffer from the input.
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of <code class="code">lex_curr_p</code> by updating it with the number of characters read
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accurate, they must be initialised before the first use of the
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<pre><span class="keyword">val</span> <a name="VALfrom_channel"></a>from_channel : <code class="type"><a href="Pervasives.html#TYPEin_channel">in_channel</a> -> <a href="Lexing.html#TYPElexbuf">lexbuf</a></code></pre><div class="info">