Supermonads: one notion to bind them all
Bracker, Jan and Nilsson, Henrik (2016) Supermonads: one notion to bind them all. In: Proceedings of the 9th International Symposium on Haskell (Haskell '16), 22-23 September 2016, Nara, Japan.
Official URL: http://dl.acm.org/citation.cfm?doid=2976002.2976012
Several popular generalizations of monads have been implemented in Haskell. Unfortunately, because the shape of the associated type constructors do not match the standard Haskell monad interface, each such implementation provides its own type class and versions of associated library functions. Furthermore, simultaneous use of different monadic notions can be cumbersome as it in general is necessary to be explicit about which notion is used where. In this paper we introduce supermonads: an encoding of monadic notions that captures several different generalizations along with a version of the standard library of monadic functions that work uniformly with all of them. As standard Haskell type inference does not work for supermonads due to their generality, our supermonad implementation is accompanied with a language extension, in the form of a plugin for the Glasgow Haskell Compiler (GHC), that allows type inference for supermonads, obviating the need for manual annotations.
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