I need the fixes that were (fairly) recently applied to class inference. Things are playing merry havoc with my code, and I want to make sure I am not jumpinmg through hoops because of a compiler fault. (And I also want to make sure any errors in inference I report are not already fixed). There are 2 solutions: 1) Can all fixes to class inference and instance overlapping be put into the 6.2.1 pre-release (a new version if necessary) 2) Could someone fix: (I corrected the import: GlaExts -> GHC.Exts) But the Addr type seems to have vanished. GenericTemplate.hs:121:19: Not in scope: data constructor `A#' Language/Haskell/Parser.hs:810:19: Not in scope: type constructor or class `Addr' Language/Haskell/Parser.hs:811:18: Not in scope: data constructor `A#' (error repeats at other line numbers). Regards, Keean.