Hi guys, I was just investigating an issue in my yesod app that prevented me from running the devel-server. It was a warning about route patterns overlapping S4M/Server/Controller.hs:33:0: Warning: Pattern match(es) are overlapped In the definition of `parse[awnQ]': parse[awnQ] : "con" : "f" [] = ... parse[awnQ] : "con" : "h" [] = ... parse[awnQ] : "con" : "m" : "list" [] = ... parse[awnQ] : "con" : "m" : "c" [] = ... The issue seems to come up when part of the route is a single character (in this case, f, h and m) like /con/f/ /con/h/ /con/m/list/ I ended up just changing my routes to be more 'expressive' which is fine by me. Haven't looked at the source of the issue yet, I can reproduce it on 0.6.2 but haven't tried 0.6.3 so I apologize in advance if it is already fixed :) Just wanted to get it out here so I don't forget to look into it later (I'm heading home now) Cheers! ----nubis :)