Every now and again I have been noticing the following in Haskell documentation: (for example in Data.Text): Subject to fusion What is fusion and how do I use it?

I have implemented a simple L1 distance calculator using Haskell. Since I am interested in performance I used unboxed vectors to store the images to compare. calculateL1Distance :: LabeledImage -&...

The following code unexpectedly (at least for me) produces an intermediate vector: import qualified Data.Vector as Vector main :: IO () main = print (test n) n :: Int n = 1000000 test :: Int -...

I'm interested in creating a new Haskell container type (strict lists), and I want to make sure that operations on them are eligible for stream fusion. How do I opt-in to ghc's stream fusion capabi...