#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 goldfire): I might have time to take a look at this, but I'll need a bit more direction. You say that you might have missed something -- what two branches can I compare to assess that? As for the one-line change: it's seems conceivable that the change could have a measurable performance impact. Have you tested the change, independent of anything else? If the fix makes performance worse, that would be an insight, because the `acc` check looks like it's only an optimization, not an essential check for correctness. Thanks! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14880#comment:106 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler