#15629: "No skolem info" panic (GHC 8.6 only) -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler (Type | Version: 8.6.1-beta1 checker) | Resolution: | Keywords: TypeInType Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Oh my, hand on. Everything should work if the eager unifier does NOTHING. Indeed, I'd love to have a flag `-fno-eager-unifier` which switches off the eager unifier in order to stress the constraint solver. It'd b easy: in `TcUnify.uType`, test the flag and call `uType_defer` immediately if `-fno-eager-unifier` is set. I bet this shows up lots of bugs, so I partly fear to suggest it :-). For this one, does the `No skolem` come back? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15629#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler