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<center><h1>nhc98 error messages</h1></center>
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<h3>What does this error message mean?</h3>
<p>
Like all compilers, the error messages produced by the <b>nhc98</b> are
sometimes difficult to understand. Here are a few tips as to what might
have gone wrong.
<dl>
<dt><tt>
Only 32 words after gc, need 32 words
</tt></dt>
<dd>
The garbage collector failed to reclaim enough space - the program is
out of heap. Try re-running with <em>+RTS -Hn -RTS</em> where
<em>n</em> is a bigger heap size, e.g. <em>16M</em>.
</dd>
<dt><tt>
Type error: cannot unify types Prelude.2 and Prelude.3 at 133:9
</tt></dt>
<dd>
In type errors, pairs, triples, and other tuples are denoted by their
arity - thus Prelude.2 means pair. The notation 133:9 means line 133,
character position 9.
</dd>
<dt><tt>
arityIS in IntState.hs couldn't find 376
</tt></dt>
<dd>
If you get an error message like this and you have an <em>(n+k)</em>
pattern in your program, then you have found a bug in the compiler.
Please report it!
</dd>
</dl>
<hr>
<p>
The latest updates to these pages are available on the WWW from
<a href="http://www.haskell.org/nhc98/">
<tt>http://www.haskell.org/nhc98/</tt></a>
<p>
10th June 1999<br>
<a href="http://www.cs.york.ac.uk/fp/">
York Functional Programming Group</a><br>
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