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<p style="margin: 1.2em 0px ! important;">This (empty) instance
declaration</p>
<pre style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block ! important;display: block; padding: 0.5em; color: rgb(51, 51, 51); background: none repeat scroll 0% 0% rgb(248, 248, 255);" class="hljs language-haskell"><span class="hljs-class"><span class="hljs-keyword">instance</span> <span class="hljs-type">Num</span> <span class="hljs-container">(<span class="hljs-title">a</span>,<span class="hljs-title">b</span>)</span> => <span class="hljs-type">Num</span> <span class="hljs-container">(<span class="hljs-title">a</spa
n>,<span class="hljs-title">b</span>,<span class="hljs-type">Int</span>)</span> <span class="hljs-keyword">where</span></span>
</code></pre>
<p style="margin: 1.2em 0px ! important;">produces the following
error when compiled with jhc 0.8.2:</p>
<pre style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;font-size: 1em; line-height: 1.2em;margin: 1.2em 0px;"><code style="font-size: 0.85em; font-family: Consolas,Inconsolata,Courier,monospace;margin: 0px 0.15em; padding: 0px 0.3em; white-space: pre-wrap; border: 1px solid rgb(234, 234, 234); background-color: rgb(248, 248, 248); border-radius: 3px; display: inline;white-space: pre; overflow: auto; border-radius: 3px; border: 1px solid rgb(204, 204, 204); padding: 0.5em 0.7em; display: block ! important;display: block; padding: 0.5em; color: rgb(51, 51, 51); background: none repeat scroll 0% 0% rgb(248, 248, 255);">$ Temp/jhc-0.8.2/jhc Temp/jhc1.hs
jhc Temp/jhc1.hs
jhc 0.8.2 (mydniquipepo-32)
Finding Dependencies...
Using Ho Cache: '/home/yom/.jhc/cache'
Temp/jhc1.hs:1 - Error: Invalid Class. multiparameter classes not yet supported:
(Num,[HsTyTuple [HsTyVar {hsTypeName = a},HsTyVar {hsTypeName = b}]])
</code></pre>
<p style="margin: 1.2em 0px ! important;">Am I misunderstanding
something, or is it a legitimate bug?</p>
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