Why does runghc fail when using -XSafe?

I am trying to run Safe Haskell code with runghc

, but it doesn't seem to work for me.

bgeron@tinker:/tmp/wtf$ ls
Strange.hs
bgeron@tinker:/tmp/wtf$ cat Strange.hs 
module Strange where

main :: IO ()
main = do
    return ()
bgeron@tinker:/tmp/wtf$ runghc -XSafe Strange

Strange:1:1: Not in scope: `System.Environment.withArgs'
bgeron@tinker:/tmp/wtf$ runghc --version
runghc 7.6.3

      

        
        
        
      

    

I thought this would be a valid use runghc

; the error is the most confusing. This is mistake?

I am using Ubuntu 14.04 64-bit.