Upcoming Cmdliner 2.0 changes that need your attention

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Other changes you may want to pay attention to is that cmdliner 2.0 will:

  1. Remove deprecated identifiers.
  2. Make the Arg.conv type abstract[1].

If you happen to be walking around your cmdliner usage or making a new cli these days, pay particular attention to 2. as the concrete type has been deprecated since 2017 but sadly it was never possible to make it a visible deprecation (OCaml compiler help us! :man_bowing:).

Note that both 1. and 2. can be resolved now by using cmdliner.1.3.0, there are a few instructions here. It’s no guaranteed, but if you are on opam I may have filed an issue in your issue tracker :waving_hand:.

P.S. I think there’s not a single occurence where I did not eventually regret making a public type concrete.

  1. So that completion behaviours can be defined at that level; aswell as the documentation metavariable which you could specify with Arg.conv constructors for ages but would simply be dropped to return the concrete pair. ↩︎

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