Have you tried _x instead?<span></span><br><br>On Saturday, January 9, 2016, Henning Thielemann &lt;<a href="mailto:lemming@henning-thielemann.de">lemming@henning-thielemann.de</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
GHC-8.0 emits several new warnings of this kind:<br>
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   Defined but not used: type variable ‘x’<br>
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for declarations like<br>
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   type instance Snd x y = y<br>
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Enthusiastically, I started to replace unused type function arguments by underscores, only to find out that older GHC versions do not accept that. With what option can I disable this warning? Or can it be removed from -Wall for now?</blockquote>