Maybe a section on closures in the Functional Rust chapter?

[divyaranjan1905]

I think Rust handles closures pretty nicely, and since there is a section on "Functions as Arguments" in that chapter, I guess that could either be expanded to include Closures.

This is especially fitting because anonymous functions that capture entire environments were initially implemented in the functional languages (Scheme) and the ideas of it were also rooted in Peter Landin's work on evaluation of lambda-terms.