Camlp4 is a system for writing extensible parsers for programming languages

It provides a set of OCaml libraries that are used to define grammars as well as loadable syntax extensions of such grammars. Camlp4 stands for Caml Preprocessor and Pretty-Printer and one of its most important applications is the definition of domain-specific extensions of the syntax of OCaml.

Camlp4 was part of the official OCaml distribution until its version 4.01.0. Since then it has been replaced by a simpler system which is easier to maintain and to learn: ppx rewriters and extension points.

This version of Camlp4 installs using the ocamlfind packaging utility. If you were using +I camlp4 to directly locate Camlp4, this will no longer work.

AuthorsDaniel de Rauglaudre and Nicolas Pouillard
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