[Haskell-cafe] Is there something for emacs to view project module structure?

Hi, I think a structure viewing in editor could be very help for long file or big project. Something like java/c# IDEs do. But I could not find a hint on google. Any suggestions? -- 竹密岂妨流水过 山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.