#9537: concatMap is not a good producer for list fusion -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: ekmett Type: bug | Status: patch Priority: normal | Milestone: 7.10.1 Component: Core | Version: 7.9 Libraries | Keywords: fusion Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: Phab:D348 | -------------------------------------+------------------------------------- Comment (by Austin Seipp <austin@…>): In [changeset:"1e269bf404fb2719bbe8d72154156ef275c9a6f9/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="1e269bf404fb2719bbe8d72154156ef275c9a6f9" Make Data.List.concatMap fuse better Summary: Fix #9537 precisely as Joachim Breitner proposed in http://www.haskell.org/pipermail/haskell-cafe/2011-December/097228.html Reviewers: austin, nomeata Reviewed By: austin, nomeata Subscribers: thomie, carter, ezyang, simonmar Differential Revision: https://phabricator.haskell.org/D348 GHC Trac Issues: #9537 }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9537#comment:4> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler