#8892: Ghc panics (variable not found) ---------------------------------------+----------------------------------- Reporter: jwlato | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time crash | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ---------------------------------------+----------------------------------- Comment (by simonpj): Yes, I'm sorry about the loop-breaker warnings -- you can safely ignore those. GHC should never produce an out-of-scope variable, so this is clearly a bug. Maybe you can try this: * Revert to -O not -O2 * Remove individual optimsations, eg `-fno-full-laziness`, `-fno-spec- constr` etc * Remove code from the module being compiled so that it is as small as possible. * And then compile with `-dverbose-core2core -ddump-occur-anal -ddump- inlinings -ddump-rule-rewrites` (as well as `-dcore-lint` and save the output somewhere I can see it. Best of all would be to get a test case I can reproduce here. Thanks Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8892#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler