GHC crashes on synonym family in a rank-n type
{-# 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
Trac metadata
Trac field | Value |
---|---|
Version | 6.10.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |