Re: [GHC] #8557: Panic "tcTyVarDetails" when :forcing a kind-polymorphic data family instance

#8557: Panic "tcTyVarDetails" when :forcing a kind-polymorphic data family instance -------------------------------------+------------------------------------ Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by Simon Peyton Jones ): In [changeset:"a8ac471d435214dbdc1fa70f938c63128993a1db/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="a8ac471d435214dbdc1fa70f938c63128993a1db" Fix the deugger (fixing Trac #8557) The runtime debugger (which has not received any love from anyone for many years) looks wrong to me; it was failing to instantiate the outer foralls of a variable when called from :force, which calls cvObtainTermFromId, which calls cvObtainTerm I simplified the code too. But I'm flaky on how this debugger stuff is really supposed to work, so I'm partly guessing. Tests pass though. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8557#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler