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1. It has a unique name, of the form foo[extra]. This causes the resolver
to treat it as a separate node in the dependency graph.
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a) We specify that we want the extra dependencies as well.
b) We add a dependency on the base candidate.
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3. We return None for the underlying InstallRequirement, as the base
candidate will provide it, and we don't want to end up with duplicates.
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decide that it should recommend foo[extra1] version 1.0 and foo[extra2]
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