
<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi,<div class=""><br class=""></div><div class="">I found a difference between GHC 7.6.3 and 7.8.3 with respect to UndecidableInstances.</div><div class=""><br class=""></div><div class=""><a href="https://gist.github.com/maoe/57a4346eb36aee159916" class="">https://gist.github.com/maoe/57a4346eb36aee159916</a></div><div class=""><br class=""></div><div class="">7.6.3 requires UndecidableInstances to compile this snippet whereas 7.8.3 doesn't. What has changed in the type checker?</div><div class=""><br class=""></div><div class="">Mitsutoshi</div><div class=""><br class=""></div></body></html>