Comments of curly bracket form, which appear at the end of type deffinitions confuse GHC

$ cat HaskarrowHelloWorld.broken.hs
main :: IO (){-# LINE 8 "" #-}
main = print "Hi"
[timothy@timothy rewrite]$ ghc HaskarrowHelloWorld.broken.hs 
[1 of 1] Compiling Main             ( HaskarrowHelloWorld.broken.hs, HaskarrowHelloWorld.broken.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 7.4.2 for x86_64-unknown-linux):
	Prelude.head: empty list

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

[timothy@timothy rewrite]$ 
$ ghc HaskarrowHelloWorld.working.hs 
[1 of 1] Compiling Main             ( HaskarrowHelloWorld.working.hs, HaskarrowHelloWorld.working.o )
Linking HaskarrowHelloWorld.working ...
[timothy@timothy rewrite]$ cat HaskarrowHelloWorld.working.hs
main :: IO ()--{-# LINE 8 "" #-}
main = print "Hi"
[timothy@timothy rewrite]$ ./HaskarrowHelloWorld.working 
"Hi"

Trac metadata

Trac field	Value
Version	7.4.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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