#7702: Memory Leak in CoreM (CoreWriter) -------------------------------------------+-------------------------------- Reporter: afarmer | Owner: Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler | Version: 7.6.2 Resolution: | Keywords: Os: Unknown/Multiple | Architecture: Unknown/Multiple Failure: Compile-time performance bug | Difficulty: Unknown Testcase: | Blockedby: Blocking: | Related: -------------------------------------------+-------------------------------- Comment(by afarmer): Both: {{{ let w3 = w1 `plusWriter` w2 return $ w3 `seq` (y, s'', w3) }}} and: {{{ let w3 = w1 `plusWriter` w2 liftIO $ evaluate w3 return (y, s'', w3) }}} will fix the leak. I'm inclined to the former, as the latter requires adding an extra import for evaluate itself. Let me know which is preferable and I'll upload a new patch. Can the testsuite check for things like maximum residency? If so, I can also contribute a minimal test case to avoid future regressions. Edward: could you address the documentation that Simon mentioned? I admit I found this mostly with lots of trial and error, and feel like you may be better at explaining #5129 than me. ;-) -- Ticket URL: http://hackage.haskell.org/trac/ghc/ticket/7702#comment:9 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler