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I've just added closure support to my toy programming language: https://github.com/Wilfred/garden/commit/d1fb4566a2187dfe98fb1d2278a7a0d2acd8059e

Closures are more fiddly than I expected, but I now have a much better understanding of what downward/upward funargs are :)

(Downward: passing a closure, upward: returning a closure)