--- /dev/null
+Typechecked:
+AbsBinds [] [] [(fubar.t439, Main.fubar{-r79-})]
+ {- nonrec -}
+ fubar.t439 :: IoWorld -> (Int, IoWorld)
+ fubar.t439
+ = (thenIO_{-r99-} [bpv83, Int]) (ccall f [bpv83] ) (ccall b [Int] )
+{- nonrec -}
+{- nonrec -}
+Desugared:
+
+Fail: panic! (the `impossible' happened):
+ getBoxedPrimTypeInfo: bpv83
+
+Please report it as a compiler bug to glasgow-haskell-bugs@dcs.glasgow.ac.uk.
+