<div dir="ltr">If you want to have something that can ignore a variable, you can just fill it in with (). T Int Char () (), then have a function :: T a b () () -> IO (). You can clean it up a little by making type aliases. type T2 a b = T a b () (), type T3 a b c = T a b c ().<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 22, 2016 at 7:32 AM, Imants Cekusins <span dir="ltr"><<a href="mailto:imantc@gmail.com" target="_blank">imantc@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">T' and T a b seem to not mix well.<div><br></div><div>T' can not be passed to a function expecting T a b and vice versa</div><div><br></div><div>any suggestions?<br></div></div>
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