libppx-visitors-ocaml-dev - 20210608-1+b2 main

Visitors is a syntax extension for the OCaml programming language. It
allows you to annotate your type definitions, such that a visitor class
will be automatically generated. This visitor class contains methods
for the traversal of your data structure, like iter, map, fold, etc. It
is then easy to override these methods for your needs. This is very
convenient when programming with complex algebraic data structures.