#9802: A ghci bug -------------------------------------+------------------------------------- Reporter: vxanica | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 7.8.3 Keywords: :force :type | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Blocked By: | None/Unknown Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Prelude> let a = [1,2,3] (0.00 secs, 0 bytes) Prelude> :t a a :: Num t => [t] Prelude> :force a a = _ Prelude> a [1,2,3] (0.02 secs, 3580816 bytes) Prelude> :print a a = (_t1::Num t => [t]) Prelude> :t _t1 ghc.exe: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-mingw32): tcTyVarDetails t{tv auB} [tv] Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9802 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler