(Modal)

Related:

Modal is a matrioshka language based on pattern-matching to rewrite trees - https://news.ycombinator.com/item?id=40126935 - April 2024 (21 comments)

This related wikipedia page is a bit hard to find, so :-) "functional languages that are based on term-rewriting instead of the lambda calculus." [1].

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1: https://en.wikipedia.org/wiki/Category:Term-rewriting_progra...