in particular, 'opam upgrade' produces message:
"upgrade not possible because of conflicts or packages no longer available: - conflicting query package camlp4.4.02.1+system"
1) how might out of situation?
2) how might avoid having happen again?
my opam 1.2.2, , ocaml 4.02.1. os linux mint (ubuntu derivative)
looks there inconsistency in ocaml repository currently. situation you've got not fault @ all. resolve issue can try manually remove or upgrade conflicting package. other approach start scratch, i.e., delete switch , install needed packages again.
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