#3101: GHC crashes on synonym family in a rank-n type
----------------------------------+-----------------------------------------
Reporter: MartijnVanSteenbergen | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.1 | Severity: normal
Keywords: | Testcase:
Os: MacOS X | Architecture: Unknown/Multiple
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{{{
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE RankNTypes #-}
module Boom where
type family F a :: *
data Boom = Boom (forall a. F a)
deriving Show
}}}
When loading the above compilation unit into GHCi, it crashes with:
{{{
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for i386-apple-darwin):
TcTyFuns.flattenType: synonym family in a rank-n type
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3101>
GHC <http://www.haskell.org/ghc/>
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