I tried to install drom via opam and got told that it conflicted with core_kernel:
⊘ remove core_kernel v0.14.1 [conflicts with opam-file-format]
↗ upgrade opam-file-format 2.1.0 to 2.1.1 [required by drom_lib]
but `opam show core_kernel` lists no dependency on opam-file-format`, and `opam show opam-file-format.2.1.1` just says
depends: "ocaml" "dune" {>= "2.0"} "alcotest" {with-test}
conflicts: "core_kernel"
with no indication as to why the conflict.
martin