impossible to install ppx_bitstring and lwt_ppx

[mbacarella]

% opam install ppx_bitstring
The following actions will be performed:
  ⊘ remove    usb                     1.3.1            [uses lwt_ppx]
  ⊘ remove    ppx_deriving            4.5              [conflicts with ocaml-migrate-parsetree]
  ⊘ remove    lwt_ppx                 2.0.1            [conflicts with ocaml-migrate-parsetree]
  ⊘ remove    ppxfind                 1.4              [conflicts with ocaml-migrate-parsetree]
  ⊘ remove    ppx_tools_versioned     5.4.0            [conflicts with ocaml-migrate-parsetree]
  ↗ upgrade   ocaml-migrate-parsetree 1.8.0 to 2.1.0   [required by ppxlib]
  ↗ upgrade   ppxlib                  0.15.0 to 0.17.0 [required by ppx_bitstring]
  ∗ install   ppx_bitstring           4.0.0

ppx_bitstring depends on "ppxlib" {build & >= "0.16.0" & < "0.18.0"}

ppxlib >= 0.16.0 & < 0.18.0 depend on "ocaml-migrate-parsetree" {>= "2.0.0"}

However,

lwt_ppx depends on "ocaml-migrate-parsetree" {>= "1.5.0" & < "2.0.0"}

So, they're incompatible.

I note ppxlib 0.15.0 declares: "ocaml-migrate-parsetree" {>= "1.5.0" & < "2.0.0"}, which would satisfy lwt_ppx and ppx_bitstring seems to compile just fine with ppxlib 0.15.0, so perhaps change to that?

[xguerin]

I'll look into it.

[xguerin]

Should be fixed now.

[mbacarella]

Thanks! :party_parrot: