I compiled the following program with ghc-5.05.20030109 ---------- import Language.Haskell.THSyntax main = putStrLn (show $(lift ('a', 'b'))) instance (Lift a, Lift b) => Lift (a,b) where lift (a,b) = tup [lift a, lift b] ----- and received the following error message ------- ghc --make -fglasgow-exts -package haskell-src -package haskell98 Main.hs -o test Chasing modules from: Main.hs Compiling Main ( Main.hs, ./Main.o ) Loading package base ... linking ... done. Loading package haskell98 ... linking ... done. Loading package haskell-src ... linking ... done. ghc-5.05.20030109: panic! (the `impossible' happened, GHC version 5.05.20030109): nameModule zdfLiftZ2T{-a1dB-} Please report it as a compiler bug to glasgow-haskell-bugs@haskell.org, or http://sourceforge.net/projects/ghc/. ------ Why? Sean Seefried