#9792: map/coerce rule never seems to fire -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: ekmett Type: bug | Status: new Priority: normal | Milestone: 7.10.1 Component: Core | Version: 7.9 Libraries | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: Runtime | Related Tickets: performance bug | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by goldfire): Forcing dictionary arguments to be strict helps here, but would that always work? For example, if we have {{{ foo :: forall (c :: Constraint). c => Proxy c -> () }}} would that still be inferred to be strict in its first (Core) parameter? Separately, I don't think my lifted/unlifted thoughts will have impact here, although the rewrite of the `Coercible` solver may. That task will begin shortly. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9792#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler