#14004: G -------------------------------------+------------------------------------- Reporter: zaoqi | Owner: (none) Type: feature request | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.10.3 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by bgamari): * status: new => closed * resolution: => invalid Comment: In general it's appreciated if you can provide at very least a title for new tickets. In this particular case I think the error message pretty much explains what's going on here: there are two instances which may match your request. GHC in general refuses to choose arbitrarily. If you want to force GHC to choose arbitrarily then you can use `IncoherentInstances`, but you get to keep both pieces if your program breaks. Closing as invalid but feel free to reopen if I have misunderstood your request. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14004#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler