Web Reference: Earlier, we skipped over the type checking phase. Let’s come back to that now. After lexing and parsing, the next phase of compilation is semantic analysis, and the primary task of semantic analysis is type checking. When explaining the OCaml type checking rules, we write exp : t to mean "the expression exp is well typed and has type t." In the following paragraphs, we explain a few of the most important type checking rules. At this level, a nominal type-checking algorithm is used. Historically, this is OCaml's first type system, as it comes from the ML programming language, OCaml's ancestor. Although OCaml has other type systems, this document focused on data typed using this algorithm.
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