#13474: GHC HEAD regression: Prelude.!!: index too large -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): Just took a look. The problem is that we're trying to make a `NthCo 0 g` where one of `g`'s types is `Constraint`. Of course, `Constraint` is identical to `TYPE LiftedRep`, so using `NthCo` is sensible, but GHC gets confused. I haven't tested it, but I'm nearly positive that merging Phab:D3316 would fix this. That patch is held up on discussions in #11715. It all boils down to a design question, and I don't feel like the discussion there has settled toward any consensus. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13474#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler