In TH code you now need to use "mkName" at variable uses instead of the names created directly with "newName". Repa had a similar problem. Eh? I don't understand that. Can you give a small example? Simon From: glasgow-haskell-users-bounces@haskell.org [mailto:glasgow-haskell-users-bounces@haskell.org] On Behalf Of Ben Lippmeier Sent: 09 August 2011 14:44 To: Bas van Dijk Cc: glasgow-haskell-users@haskell.org Mailing List Subject: Re: Build failure of syb-with-class with ghc-7.2.1 On 09/08/2011, at 23:15 , Sergei Trofimovich wrote: the HEAD of syb-with-class fails with the following error when build with ghc-7.2.1 and template-haskell-2.6: http://code.google.com/p/syb-with-class/issues/detail?id=4 Is this a bug in TH? Very likely: http://hackage.haskell.org/trac/ghc/ticket/5362 In TH code you now need to use "mkName" at variable uses instead of the names created directly with "newName". Repa had a similar problem. Ben.