The original implementation of Multicore OCaml allowed a user to Obj.clone_continuation. This has been removed, the examples that used this are in the multishot directory. See this conversation about the removal of this feature. They now use the ocaml-multicont library.
To run the examples with Multicore OCaml, be sure to install Opam with these instructions. If your version of Opam (opam --version) is greater than or equal to 2.1 then the following instructions will work:
If your version of Opam is less than 2.1, then you will also need to add the beta repository when creating the switch. All of the other commands remain the same.
If you are citing this work in an academic paper, please cite the PLDI 2021 paper "Retrofitting Effect Handlers onto OCaml": https://dl.acm.org/doi/10.1145/3453483.3454039.