#14247: Fails to coerce between newtypes directly -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by goldfire): The `Coercible` solver is incomplete when recursive newtypes come into play. We admit this in the JFP paper. I don't know how to do better. And I'm pretty sure the problem is undecidable, anyway. Did this come up in the wild? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14247#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler