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This is kind of misleading. Stream fusion isn't baked into Haskell; you need to use a library. [1,2] [1] - https://ghc.haskell.org/trac/ghc/ticket/915

• danieldk 13y ago
  But, many of the commonly used libraries already use stream fusion, e.g. vector and text.
• coolsunglasses 13y ago
  http://hackage.haskell.org/package/text-0.1/docs/Data-Text-Fusion.html http://hackage.haskell.org/package/text-0.1/docs/Data-Text-F... http://hackage.haskell.org/package/vector-0.9.1/docs/Data-Vector-Fusion-Stream.html http://hackage.haskell.org/package/vector-0.9.1/docs/Data-Ve... Except it's bloody everywhere in the libraries you use and you can design your own libraries around it. A language powerful enough that things like this can be done in libraries instead of in the compiler is a good thing.