ocaml transition: ppx_deriving

[Ralf Treinen <treinen@irif.fr>]

Hello,

one of the current blockers for the ocaml transition is ppx_deriving.
The current version in sid (4.1) does not compile with ocaml 4.05 and
should probably be upgraded to 4.2. This version, however, has a new
dependency ppx_derivers [1,2] which AFAICS is not yet packaged in debian.
Is anybody working on this ? If not, is there a plan ? We could either
package ppx_derivers which will have to go through NEW, hence causing
a further delay, or try to patch up ppx_deriving 4.1 to make it compile for
now. Any opinions or ideas ?

-Ralf.

[1] https://opam.ocaml.org/packages/ppx_derivers/
[2] https://github.com/diml/ppx_derivers