Polymorphism, subtyping and type inference in MLsub

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• Stephen Dolan, University of Cambridge
• Friday 16 December 2016, 14:00-15:00
• FW26.

If you have a question about this talk, please contact Dominic Mulligan.

We present a type system combining subtyping and ML-style parametric polymorphism. Unlike previous work, our system supports type inference and has compact principal types. We demonstrate this system in the minimal language MLsub, which types a strict superset of core ML programs.

This is made possible by keeping a strict separation between the types used to describe inputs and those used to describe outputs, and extending the classical unification algorithm to handle subtyping constraints between these input and output types. Principal types are kept compact by type simplification, which exploits deep connections between subtyping and the algebra of regular languages. An implementation is available online.

This talk is part of the Logic and Semantics Seminar (Computer Laboratory) series.

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