OCaml 4.11 incompatibility

[XVilka]

Along with the Longindent.parse deprecation there is seem to be a fatal error: "OCaml and preprocessor have incompatible versions":

- 14 |   let lident x = mk (Longident.parse x)
-                           ^^^^^^^^^^^^^^^
- Alert deprecated: Longident.parse
- this function may misparse its input,
- use "Parse.longident" or "Longident.unflatten"
-     ocamlopt src/gen/.gen_ast_pattern.eobjs/native/import.{cmx,o}
- File "src/gen/import.ml", line 14, characters 21-36:
- 14 |   let lident x = mk (Longident.parse x)
-                           ^^^^^^^^^^^^^^^
- Alert deprecated: Longident.parse
- this function may misparse its input,
- use "Parse.longident" or "Longident.unflatten"
-     ocamldep traverse/.ppxlib_traverse.objs/ppxlib_traverse.pp.ml.d (exit 2)
- (cd _build/default && /home/travis/.opam/ocaml-variants.4.11.0+trunk/bin/ocamldep.opt -modules -impl traverse/ppxlib_traverse.pp.ml) > _build/default/traverse/.ppxlib_traverse.objs/ppxlib_traverse.pp.ml.d
- >> Fatal error: OCaml and preprocessor have incompatible versions
- Fatal error: exception Misc.Fatal_error
[ERROR] The compilation of ppxlib failed at
        "/home/travis/.opam/opam-init/hooks/sandbox.sh build dune build -p
        ppxlib -j 1".

See full log at https://travis-ci.org/github/ocaml-ppx/ppx_deriving/jobs/683869554#L883
Caught in ocaml-ppx/ppx_deriving#220 by @kit-ty-kate

[kit-ty-kate]

my comment has an edit. The issue was fixed in the latest release