#16310: Program fails with "Impossible case alternative" when optimized -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Resolution: wontfix | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Well, `axiom` is being used to prove functional extensionality, which is generally safe. But perhaps it would be better to put the use of `unsafeCoerce` in `funExt` directly. I wonder if that quells the problem. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16310#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler