#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 goldfire): This goes back to the kind inference debate we had when working on #14066. The debate is memorialized [https://ghc.haskell.org/trac/ghc/wiki/GhcKinds/KindInference here], toward the top. Suppose we have {{{#!hs data Proxy (k :: Type) (a :: k) = Proxy -- NB: CUSK }}} Do we accept {{{#!hs type ProxySym k a = Proxy k a data ProxyData k a = MkProxyData (Proxy k a) }}} Related are your thoughts on #14847 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15142#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler