#12234: 'deriving Eq' on recursive datatype makes ghc eat a lot of CPU and RAM -------------------------------------+------------------------------------- Reporter: slyfox | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: deriving-perf Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): The solver for `Coercible` is known to struggle with recursive newtypes, where coercibility is (I believe) undecidable. Maybe we should use "stock" for recursive newtypes? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12234#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler