#9780: dep_orphs in Dependencies redundantly records type family orphans -------------------------------------+------------------------------------- Reporter: ezyang | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Compiler | Version: 7.9 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * status: closed => new * resolution: fixed => Comment: I now realize this bug report is not just about changing the invalid comment, but also about performing the optimization mentioned in the title. In `main/HscTypes.hs`: {{{ , dep_orphs :: [Module] -- ^ Transitive closure of orphan modules (whether -- home or external pkg). -- -- (Possible optimization: don't include family -- instance orphans as they are anyway included in -- 'dep_finsts'. But then be careful about code -- which relies on dep_orphs having the complete list!) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9780#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler