#12234: 'deriving Eq' on recursive datatype makes ghc eat a lot of CPU and RAM -------------------------------------+------------------------------------- Reporter: slyfox | Owner: Type: bug | Status: merge Priority: normal | Milestone: 8.0.3 Component: Compiler | Version: 8.0.1 Resolution: | Keywords: deriving-perf Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Compile-time | Test Case: performance bug | perf/should_compile/T12234 Blocked By: | Blocking: Related Tickets: #13056 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * related: => #13056 Comment: #13056 demonstrates another occurrence of this bug, this time involving `Foldable`. But unlike the program in this ticket, it doesn't require any GHC extensions like `UndecidableInstances` to trigger it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12234#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler