#13018: TH-spliced pattern synonym declaration fails to typecheck -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.0.1 checker) | Keywords: Resolution: | PatternSynonyms Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects | Unknown/Multiple valid program | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): I'm not sure if the advice in comment:9 is feasible, sadly. Not only would you need to generalize `extractHsTyRdrTyVars` to work over `RdrName`s and `Name`s (which I was able to do), you also have to overcome the issue that `repHsPatSynSigType` lives in `DsM` (i.e., `TcRnIf DsGblEnv DsLclEnv`) but `extractHsTyRdrTyVars` lives in `RnM` (i.e., `TcRnIf TcGblEnv TcLclEnv`). I don't see a way to generalize the return type of `extractHsTyRdrTyVars` in a way that wouldn't have an enormous ripple effect across tons of GHC API functions, so I'm giving up on this for now. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13018#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler