File "src/jbuild", line 18, characters 17-40: # Error: "ocaml-migrate-parsetree" is not a ppx driver during the opam upgrade with dune-1.0 about ppxlib

[xclerc]

I stumbled upon this one yesterday.

The fix, as provided to me by @diml, is to reinstall
ocaml-migrate-parsetree after installing the dune
package.

[neojski]

Doing opam update && upam upgrade didn't fix it for me but doing opam uninstall ocaml-migrate-parsetree && opam install ocaml-migrate-parsetree did the trick and I was able to install core after that. I'm using ocaml 4.06.0 and opam 1.2.2.

This should be fixed since this PR

[basus]

The referenced PR seems to have been merged, but I'm still getting the original error. I'm running OCaml 4.06.1 and OPAM 1.2.2 on Arch Linux.

[jonludlam]

I also just hit this with just an opam update; opam upgrade - the workaround of reinstalling ocaml-migrate-parsetree worked for me. I'm using opam 2.0.0 rc4.

If you do opam update followed by opam upgrade, does it reinstall ocaml-migrate-parsetree?

[cfcs]

This is broken for me too, latest version of opam, on debian.

[cfcs]

perhaps we could update the constraint in the opam file to be = 1.0.11 since >= 1.0.9 doesn't seem to work?

EDIT: That worked, I made a PR.

[XVilka]

I am closing it as solved.