[GHC] #14880: GHC panic: updateRole
GHC
ghc-devs at haskell.org
Wed Apr 11 17:18:33 UTC 2018
#14880: GHC panic: updateRole
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Reporter: RyanGlScott | Owner: goldfire
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler (Type | Version: 8.2.2
checker) |
Resolution: | Keywords: TypeInType
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: |
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Comment (by RyanGlScott):
Replying to [comment:6 goldfire]:
> With the `Foo` in comment:3, this also panics:
It does? I must be doing something wrong, since this appears to compile
for me:
{{{#!hs
{-# LANGUAGE GADTs #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeInType #-}
module Bug where
import Data.Kind
import Data.Proxy
data Foo (x :: Type) :: forall (a :: x). Proxy a -> Type
quux :: forall x arg. Proxy (Foo arg) -> Maybe x
quux = undefined
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14880#comment:7>
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