utop user needs to manually load `compiler-libs/ocamlcommon.cma`

[objmagic]

or use utop-full. See ocaml-community/utop#213.

Since README already says to use "standard OCaml toplevel", so I'll just open an issue here for people who try to use utop and see the same error as me.

[rneswold]

Is this issue why I can't try your examples as-is in utop?

# #require "ppx_stage.ppx";;
Error: Reference to undefined global `Ast_helper'

I even tried loading compiler-libs and I still get the same error.

(Thanks for writing this processor! I was hoping MetaOCaml would be released for 4.06, but this seems to be a much better way to add it to the language.)

[rneswold]

Nevermind. I didn't know utop-full was part of the build for utop and the full version loads it fine.