Standard Jane Street ppx rewriters

ppx_jane is a set of preprocessors based on ppxlib including all standard ppx rewriters.

Using ppx_jane in the toplevel

The default way is to do #require "ppx_jane" in the OCaml toplevel. However this has been reported to be very slow. If this is the case, try this instead:

#ppx "ppx-jane -as-ppx"

The main difference is that the first method will fire many different executables per command, each one doing their own pass, while the second will fire only one which efficiently combine all the rewritings.