<div dir="ltr">I have updated the page, with a bit more detail and an additional plan<br><div class="gmail_extra"><span style="font-size:12.0pt"> </span><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div link="blue" vlink="purple" lang="EN-GB"><div class="m_1327061558791023464m_-8694704311956144232WordSection1">
<p class="MsoNormal"><span style="font-size:12.0pt">OK.  It’s hard to keep this straight in email. Take a look at</span></p>
<p class="MsoNormal" style="text-indent:5.25pt"><span style="font-size:12.0pt"><a href="https://ghc.haskell.org/trac/ghc/wiki/ImplementingTreesThatGrow/Instances" target="_blank">https://ghc.haskell.org/trac/g<wbr>hc/wiki/ImplementingTreesThatG<wbr>row/Instances</a></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"> </span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Please edit and improve it.</span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"></span></p></div></div></blockquote></div></div></div></div></blockquote></div><div class="gmail_quote"><br></div><div class="gmail_quote">Alan<br></div></div></div>