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.o

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.