These notes and accompanying OCaml source code take a hands-on approach in introducing fundamental programming language concepts.

You will need to install:

• opam: the package manager for OCaml. Follow instructions here: https://opam.ocaml.org/doc/Install.html
• ocaml: the language we use as host for implementing our interpreters. Follow the instructions here: https://ocaml.org/docs/install.html
• menhir: the lexer and parser generator. Just type opam install menhir
• ounit: the unit testing library. Just type opam install ounit2
• dune: the standard build system for OCaml. Just type opam install dune

This is a two step process. First you build and install the parser, then you build and run the interpreters.

In the folder src/parser_plaf, type the following

    # dune build
    # dune install

In the folder src/let/lib, type the following

    # dune utop

If you get error "Error: Unbound module MenhirLib.LexerUtil", try opam upgrade menhir

If you get "Error: Version 3.2 of dune is not supported.", try opam upgrade dune