a new impossible happened in ghci?

Hi, My preliminary search indicated this is new, but still, should I add this to GHC Trac? Maybe I just cannot formulate my query well. See the ghci session log at the end. Peter. status:0 peter@dwarf [715] ~ % ghci GHCi, version 6.10.1: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer ... linking ... done. Loading package base ... linking ... done. Prelude> :def err (\_->return$concat$replicate(read "\"1\"") "a") Prelude> :err ghc: panic! (the 'impossible' happened) (GHC version 6.10.1 for i386-unknown-linux): Prelude.read: no parse Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug status:0 peter@dwarf [715] ~ %