opam dependency seq is being interpreted as version base which is breaking esy builds

[yawaramin]

In latest master:

ocaml-re/re.opam

Line 26 in a3a1924

"seq"

Dependency seq without an explicit version range is being interpreted as version base which seems to be the 'default' version: http://opam.ocaml.org/packages/seq/

This version requires ocaml >= 4.07.0

This breaks packages using older OCaml versions

Fix would be to specify an explicit seq version e.g. 0.2.2 which does not depend on ocaml >= 4.07.0

[yawaramin]

So, the versioning mechanism has just been explained to me. Apparently this is a little bit of package resolution to make the compat package work automatically across OCaml versions. Closing this issue, and sorry for the noise!