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I found a bug in the variants implementation.
If you have several scopes with the same implementation library inside, the same implementation is considered multiple times for variant selection, which creates a conflict.
Such case happens when there are multiple
.opam
in a project directory.This is the minimal fix which uses a
Set
to eliminate duplicates. The proper fix would be to changeVariant.Map.Multi.t
to be a map from variant to lib_info sets. Is this enough or should I make the proper fix ?