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##
# Resolver sets are used to look up specifications (and their
# dependencies) used in resolution. This set is abstract.
class Gem::Resolver::Set
##
# The find_all method must be implemented. It returns all Resolver
# Specification objects matching the given DependencyRequest +req+.
def find_all req
raise NotImplementedError
end
##
# The #prefetch method may be overridden, but this is not necessary. This
# default implementation does nothing, which is suitable for sets where
# looking up a specification is cheap (such as installed gems).
#
# When overridden, the #prefetch method should look up specifications
# matching +reqs+.
def prefetch reqs
end
end
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