ASSERT fails on newtype + forall

The following module causes an ASSERT failure in the HEAD version of ghc 6.5.

==== BadNewtype.hs ====
module BadNewtype where

newtype Foo = forall a . Foo a

================

> ghci-6.5 -fglasgow-exts BadAssert.hs 

Loading package base-1.0 ... linking ... done.
[1 of 1] Compiling BadAssert        ( BadAssert.hs, interpreted )
*** Exception: ASSERT failed! file typecheck/TcTyClsDecls.lhs, line 466
>

Trac metadata

Trac field	Value
Version
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

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