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No value restriction is needed for algebraic effects andhandlers*

Part of:JFP Research Articles

Published online by Cambridge University Press:  24 January 2017

OHAD KAMMAR and
MATIJA PRETNAR
OHAD KAMMAR
Affiliation:
Computer Laboratory, University of Cambridge, England (e-mail: ohad.kammar@cl.cam.ac.uk)Department of Computer Science, University of Oxford, England (e-mail: ohad.kammar@cs.ox.ac.uk)
MATIJA PRETNAR
Affiliation:
Faculty of Mathematics and Physics, University of Ljubljana, Slovenia (e-mail: matija.pretnar@fmf.uni-lj.si)
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Abstract

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We present a straightforward, sound, Hindley–Milner polymorphic typesystem for algebraic effects and handlers in a call-by-value calculus, which, toour surprise, allows type variable generalisation of arbitrary computations, andnot just values. We first recall that the soundness of unrestrictedcall-by-value Hindley–Milner polymorphism is known to fail in thepresence of computational effects such as reference cells and continuations, andthat many programming examples can be recast to use effect handlers instead ofthese effects. After presenting the calculus and its soundness proof, formalisedin Twelf, we analyse the expressive power of effect handlers with respect tostate effects. We conjecture handlers alone cannot express reference cells, butshow they can simulate dynamically scoped state, establishing that dynamicbinding also does not need a value restriction.

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Journal of Functional Programming , Volume 27 , 2017, e7
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Copyright © Cambridge University Press 2017 

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