Nepal -- nested data parallelism in Haskell. This paper discusses an extension of Haskell by support for nested data-parallel programming in the style of the special-purpose language NESL. The extension consists of a parallel array type, array comprehensions, and primitive parallel array operations. This extension brings a hitherto unsupported style of parallel programming to Haskell. Moreover, nested data parallelism should receive wider attention when available in a standardised language like Haskell.

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