#9062: Role: ~# should be ~R# ---------------------------------+------------------------------------ Reporter: conal | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: MacOS X | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: ---------------------------------+------------------------------------ Comment (by simonpj): I can't say for sure (would need to reproduce), but I think that a coercion `(co1 -> co2)` is represented by a `TyConAppCo`, which in turn carries a role. So it looks as if the role on that `TyConAppCo` with `(->)` in the type constructor position is plain wrong. Is this with your plugin, or is this plain GHC? How can we reproduce? Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9062#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler