#10388: GHC panic when compiling Yesod app -------------------------------------+------------------------------------- Reporter: chfi | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.10.1 Keywords: | Operating System: MacOS X Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -------------------------------------+------------------------------------- When compiling a Yesod app, using 'yesod devel', GHC crashes with the following error: {{{ <no location info>: ghc: panic! (the 'impossible' happened) (GHC version 7.10.1 for x86_64-apple-darwin): Loading temp shared object failed: dlopen(/var/folders/yb/98yhr6bj5fg3z68prq2gxs6w0000gn/T/ghc99761_0/libghc99761_51.dylib, 5): Symbol not found: _adverzuGWP0VNzzhgmvBNANratclKO_SubscriptionType_zdfPersistFieldKey_closure Referenced from: /var/folders/yb/98yhr6bj5fg3z68prq2gxs6w0000gn/T/ghc99761_0/libghc99761_51.dylib Expected in: flat namespace in /var/folders/yb/98yhr6bj5fg3z68prq2gxs6w0000gn/T/ghc99761_0/libghc99761_51.dylib }}} Specifically, I'm using Yesod's mkPersist to create a data type, and it works fine, until I make said type an instance of FromJSON, in which case the above panic occurs. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10388 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler