#5316: Orphan instances strike again: ghc rejects a program at first but will accept it if you repeat the same compilation command -------------------------------------+------------------------------------- Reporter: jcpetruzza | Owner: Type: bug | Status: closed Priority: low | Milestone: ⊥ Component: Compiler | Version: 7.0.4 Resolution: duplicate | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: 2182 | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by ezyang): * status: new => closed * resolution: => duplicate * blockedby: => 2182 Comment: I was reviewing orphan instance tickets, and I think this one was fixed by #2182; Simon's analysis is essentially the same. I can't actually test it on the test-case given because `System.Event.Manager` has changed since then. The one thing that you might find puzzling is the situation with optimization: but actually it is simple to explain: optimization simply means we might tug on more `ModIface`s because we have to process unfoldings, etc. With the fix for #2182, the orphan instances that are pulled in from this process are unaffected. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/5316#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler