ocaml/opam-repository — pull request #1494 by orbitz (2013-12-21 21:08:05+00:00)
Title: Add gen_server 2.0.0

Adds backwards incompatible API change: returning an Error requires taking an error and state now. Previously one could not do a controlled terminate by Error and update the state value, meaning the state passed to the terminate callback could be stale.