#15142: GHC HEAD regression: tcTyVarDetails -------------------------------------+------------------------------------- Reporter: RyanGlScott | Owner: goldfire Type: bug | Status: new Priority: highest | Milestone: 8.6.1 Component: Compiler (Type | Version: 8.5 checker) | Keywords: TypeInType, Resolution: | TypeFamilies, CUSKs Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): As far as I can tell, the only available workaround for this issue is to explicitly quantify `k`, like so: {{{#!hs class ListTuple (tuple :: Type) k (as :: [(k, Type)]) where type ListToTuple as :: Type }}} `generic-lens` may need to employ this hack if this issue hasn't been fixed by 8.6.1's release. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15142#comment:14 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler