#13788: TypeInType fails to compile old code -------------------------------------+------------------------------------- Reporter: br1 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: 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 goldfire): This isn't an issue with `TypeInType`, per se, but with `PolyKinds`, which originally added kind generalization. (You'll find that compiling with just `PolyKinds` causes the same effect as you're observing with `TypeInType`.) Many of the language "extensions" have the potential to break code. For example, `OverloadedStrings` can cause declarations like `x = length "hi"` to fail, because GHC can no longer tell what type `"hi"` should be. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13788#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler