#9117: Coercible constraint solver misses one -------------------------------------+------------------------------------ Reporter: goldfire | Owner: nomeata Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by goldfire): Yes, but the library-writer could just use a newtype to get this functionality. For example, if the writer of `Set` wants coercions internally, they use `SetInternal` with no role annotations and then `Set` with a role annotation. It's a little bit of (compile-time-only) overhead, but it should be usable. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9117#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler