#14164: GHC hangs on type family dependency -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: | InjectiveFamilies Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: indexed- | types/should_compile/T14164 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * status: closed => new * resolution: fixed => Comment: Richard and I had a chat yesterday. He is going to * Write the invariant in comment:13, along with a Note to explain it (based on this ticket). * Add an ASSERT to check it. * Comment `substTy` and `substCo`, in the variable cases, to explain why we do not need to substitute in the kind of a type variable, or the type of a coercion variable. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14164#comment:15 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler