Remove everything in the DependencyList that matches but doesn’t satisfy items in dependencies (a hash of gem names to arrays of dependencies).
Search through all unresolved deps and sub-dependencies and return specs that contain the file matching path.
Creates the initial state for the resolution, based upon the {#requested} dependencies @return [DependencyState] the initial state for the resolution
Used to detect if the gem is bundled in older version of Ruby, but not detectable as default gem (see BasicSpecification#default_gem?).
Reset nil attributes to their default values to make the spec valid
Unwinds the states stack because a conflict has been encountered @return [void]
@return [Integer] The index to which the resolution should unwind in the
case of conflict.