Hi, I am resending the following bug report. It was first reported under NHC 1.02 but seems to be still present in NHC 1.06. I got following error: ==================================== Error when renaming:: Unbound Identifier a0 at 4:44 ... (lots of internal compiler state lines) under NHC 1.02 cygwin (win2k), although I think the program that caused this is correct. The program consists of 2 small files: File Test1.hs: --- module Test1(fn) where import Test2 fn :: Test -> Int fn t@(Test { a0 = a } ) = a0 t + a --- File Test2.hs: --- module Test2(Test(..)) where data Test = Test { a0 :: Int, b0 :: Int } -- I compiled Test2.hs with "nhc98 -c Test2.hs" and then tried to compile Test1.hs and got this error. Best regards, Mark