#5853: Out-of-memory crash when using RULES and type families
--------------------------------+-------------------------------------------
Reporter: porges | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Windows | Architecture: x86_64 (amd64)
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
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GHC(i) 7.4.1 crashes with an OOM error on the following code:
{{{
{-# LANGUAGE NoImplicitPrelude, TypeFamilies #-}
import Prelude (undefined,Bool(..),Show(..),(.))
type family Elem f :: *
type family Subst f b :: *
class (Subst fa (Elem fa) ~ fa) => F fa where
(<$>) :: (Elem fa ~ a, Elem fb ~ b,
Subst fa b ~ fb, Subst fb a ~ fa) =>
(a -> b) -> (fa -> fb)
{-# RULES
"map/map" forall f g xs. f <$> (g <$> xs) = (f.g) <$> xs
#-}
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5853>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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