#14880: GHC panic: updateRole -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: 8.8.1 Component: Compiler (Type | Version: 8.2.2 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: #15076 | Differential Rev(s): Phab:D4769 Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Re comment:83 1. I think that `InterestingVarFun` is `const True`, so it only adds overhead. 2. I think you mean that `NDFV` keeps a set of forall-bound variables, and checks in that set before adding to the accumulator. But foralls are rare (I think), so the set will typically be empty. 3. That leaves the accumulator-style as the main candidate. As Richard says, though, the way to find out is to try it one thing at a time. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14880#comment:84 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler