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Recap

In this part, we transitioned from untyped lambda calculus to the simply typed lambda calculus and saw how static types improve confidence and structure in programs. We implemented STLC typing and call-by-value evaluation in Rust, then extended the language with natural numbers and recursion, optimized natural-number execution using big integers, and added product types, sum types, and list types with their corresponding typing and reduction rules. Altogether, this part built a practical, extensible typed core for programming-language implementation work.

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