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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="generator" content="hevea 2.16">
<style type="text/css">
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<title>example</title>
</head>
<body >
<!--HEVEA command line is: /usr/bin/hevea -fix example -->
<!--CUT STYLE article--><!--CUT DEF section 1 --><p>Two simple declarations:
</p><div class="lstlisting chklisting"><span style="font-family:sans-serif"><span style="font-weight:bold">let</span></span><span style="font-family:sans-serif"> </span><span style="font-family:sans-serif">x</span><span style="font-family:sans-serif"> = 3</span><span style="font-family:sans-serif">
</span><span style="font-family:sans-serif"><span style="font-weight:bold">let</span></span><span style="font-family:sans-serif"> </span><span style="font-family:sans-serif">f</span><span style="font-family:sans-serif"> </span><span style="font-family:sans-serif">x</span><span style="font-family:sans-serif"> = </span><span style="font-family:sans-serif">x</span><span style="font-family:sans-serif"> + 1</span></div><p>and, after compilation with <em>ocamlc -i example.ml</em>, their types:
</p><div class="lstlisting chklistingmsg">val x : int
val f : int -> int</div><p>Then, building on these definitions:
</p><div class="lstlisting chklisting"><span style="font-family:sans-serif"><span style="font-weight:bold">let</span></span><span style="font-family:sans-serif"> </span><span style="font-family:sans-serif">y</span><span style="font-family:sans-serif"> = </span><span style="font-family:sans-serif">f</span><span style="font-family:sans-serif"> 3</span></div><div class="lstlisting chklistingmsg">val y : int</div><p>What about compiler error messages?:
</p><div class="lstlisting chklisting"><span style="font-family:sans-serif"><span style="font-weight:bold">let</span></span><span style="font-family:sans-serif"> </span><span style="font-family:sans-serif">z</span><span style="font-family:sans-serif"> = 3 + </span><span style="font-family:sans-serif"><span style="font-family:sans-serif">"four"</span></span></div><p>They are also detected:
</p><div class="lstlisting chklistingerr">File "example.ml", line 1, characters 12-18:
Error: This expression has type string but an expression was expected of type
int</div><p>We can continue on from earlier examples:</p><div class="lstlisting chklisting"><span style="font-family:sans-serif"><span style="font-weight:bold">let</span></span><span style="font-family:sans-serif"> </span><span style="font-family:sans-serif">z</span><span style="font-family:sans-serif"> = </span><span style="font-family:sans-serif">f</span><span style="font-family:sans-serif"> </span><span style="font-family:sans-serif">y</span></div><div class="lstlisting chklistingmsg">val z : int</div><!--CUT END -->
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<!--FOOTER-->
<hr style="height:2"><blockquote class="quote"><em>This document was translated from L<sup>A</sup>T<sub>E</sub>X by
</em><a href="http://hevea.inria.fr/index.html"><em>H</em><em><span style="font-size:small"><sup>E</sup></span></em><em>V</em><em><span style="font-size:small"><sup>E</sup></span></em><em>A</em></a><em>.</em></blockquote></body>
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