NDLI: A Lazy Language Needs a Lazy Type System: Introducing Polymorphic Contexts

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A Lazy Language Needs a Lazy Type System: Introducing Polymorphic Contexts

Content Provider	ACM Digital Library
Author	Viera, Marcos Dijkstra, Atze Swierstra, S. Doaitse
Abstract	Most type systems that support polymorphic functions are based on a version of System-F. We argue that this limits useful programming paradigms for languages with lazy evaluation. We motivate an extension of System-F alleviating this limitation. First, using a sequence of examples, we show that for lazily evaluated languages current type systems may force one to write a program in an unnatural way; in particular, we argue that in such languages the relationship between polymorphic and existential types can be made more systematic by allowing to pass back (part of) an existential result of a function call as an argument to the function call that produced that value. After presenting our extension to System-F we show how we can implement the strict-state thread monad ST by using a returned existential type to instantiating a polymorphic function that returns that type. Currently this monad is built-in into the runtime system of GHC and as such has become part of the language. Our proposed language extension, i.e. the introduction of polymorphic contexts, reverses the relationship between the context of a function call and the called function with respect to where it is decided with which type to instantiate a type variable.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISBN	9781450347679
DOI	10.1145/3064899.3064906
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-08-31
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Type systems State monad Existentials System-f Lazy evaluation
Content Type	Text
Resource Type	Article

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