#12648: Stack overflow when using monad-unlift -------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by nh2): Aha, I made a simple mistake: I wrote `MonadBaseUnlift m IO` instead of `MonadBaseUnlift IO m`. I assume that's a result of `UndecidableSuperClasses` used at https://github.com/fpco/monad- unlift/blob/adb7869adccc66247cbb1a6175277802e9c098e1/monad- unlift/Control/Monad/Trans/Unlift.hs#L13. So, the remainder of this ticket is probably: Can we make GHC tell us what the problem here is (e.g. with a message like `Gave up trying to resolve ... something something` instead of the crash)? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12648#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler