Web Reference: Defining the small-step semantics of `let` expressions, based on substitution Textbook: https://cs3110.github.io/textbook...more. Another way to understand let definitions at the toplevel is that they are like let expression where we just haven't provided the body expression yet. Implicitly, that body expression is whatever else we type in the future. As it comes to the structure of programming languages, we study the different layers of syntax and semantics at the example of the idealised functional programming language Mini-OCaml.
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