[Haskell-cafe] stream fusion -- multi-module programs

In the paper "Stream Fusion: From Streams To Lists To Nothing At All", we find: For large multi-module programs, the results are less clear, with just as many programs speeding up as slowing down. We find that for larger programs, GHC has a tendency to miss optimisation op- portunities for stream fusible functions across module boundaries, which is the subject of further investigation. What's the state of these things? Is this still an issue for stream fusion? -- Jason Dusek