Incorrect arrow rec {} notation crashes in ghci

[ ~ ]% ghci -fglasgow-exts -farrows                                                                         
GHCi, version 6.8.1: http://www.haskell.org/ghc/  :? for help
Loading package base ... linking ... done.
Prelude> do { rec { x <- undefined -< x }; undefined -< x }
ghc-6.8.1: panic! (the 'impossible' happened)
  (GHC version 6.8.1 for i386-unknown-linux):
        tcDoStmt: unexpected Stmt
    rec {(x{v anj}) <- base:GHC.Err.undefined{v rle} -< x{v anj}}

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Prelude> Leaving GHCi.
[ ~ ]% ghc --version                                                                                         
The Glorious Glasgow Haskell Compilation System, version 6.8.1
[ ~ ]% uname -a                                                                                             
Linux madhatter 2.6.22-gentoo-r8 #6 PREEMPT Sat Oct 20 04:19:22 GMT 2007 i686 AMD Turion(tm) 64 Mobile Technology ML-40 AuthenticAMD GNU/Linux

Trac metadata

Trac field	Value
Version	6.8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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