Notes on Implementing Algebraic Subtyping (blog post + language) (semantic.org)
from armchair_progamer@programming.dev to programming_languages@programming.dev on 05 May 22:00
https://programming.dev/post/13695387

Algebraic Subtyping is a type system devised by Stephen Dolan in 2016, in his dissertation. It extends Hindley-Milner with subtyping, in a way that preserves decidability and principality. Over the past few years, I have implemented Algebraic Subtyping in my language Pinafore (omitting record types). Pinafore is, as far as I know, currently the only language to implement this type system besides Dolan’s own MLsub prototype.

See also: Pinafore and Sixteen Unusual Things about Pinafore

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