[Haskell-cafe] ghc-mod split feature

Hi, i just wanted to try some of the ghcmod features that I haven't used before in order to hopefully add them to my vim haskell workflow somehow. What I apparently can't get to work is the split command: $ ghc-mod split src/Foo.hs Foo 47 7 which points to exactly the code listed in the ghc-mod help: f :: [a] -> a f x = _ It does however not yield any output at all. Am I missing something obvious here ? I'm using version 5.2.1.1 Thanks, Tobi