#9279: Optimisation bug --------------------------------------------+------------------------------ Reporter: simonmar | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Runtime performance bug | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Comment (by simonpj): So how do I reproduce this? I get {{{ simonpj@cam-05-unx:~/tmp/T9279$ ghc -O2 Haxl/Core/Monad.hs Haxl/Core/Types.hs:66:8: Could not find module ‘Data.Aeson’ Perhaps you meant Data.Version (from base) Use -v to see a list of the files searched for. Haxl/Core/Types.hs:67:8: Could not find module ‘Data.Hashable’ Use -v to see a list of the files searched for. Haxl/Core/Types.hs:72:8: Could not find module ‘Data.HashMap.Strict’ Perhaps you meant Data.IntMap.Strict (from containers-0.5.5.1) Data.Map.Strict (from containers-0.5.5.1) Use -v to see a list of the files searched for. Haxl/Core/Monad.hs:73:8: Could not find module ‘Control.Concurrent.STM’ Perhaps you meant Control.Concurrent.QSem (from base) Control.Concurrent (from base) Control.Concurrent.Chan (from base) Use -v to see a list of the files searched for. }}} Also can you try with `-ddump-inlinings -dverbose-core2core -ddump-occur- anal` and add the log file? Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9279#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler