#10429: GHC fails to import instance -------------------------------------+------------------------------------- Reporter: crockeea | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by rwbarton): * status: new => closed * resolution: => invalid Comment: You have two versions of `transformers` installed under 7.10. See http://www.yesodweb.com/blog/2014/09/woes-multiple-package-versions or search Google for "No instance for MonadTrans" for more information. Also see #9611 about improving the error message in this case. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10429#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler