Gem::RequestSet#resolve

# File tmp/rubies/ruby-3.1.3/lib/rubygems/request_set.rb, line 385
def resolve(set = Gem::Resolver::BestSet.new)
  @sets << set
  @sets << @git_set
  @sets << @vendor_set
  @sets << @source_set

  set = Gem::Resolver.compose_sets(*@sets)
  set.remote = @remote
  set.prerelease = @prerelease

  resolver = Gem::Resolver.new @dependencies, set
  resolver.development         = @development
  resolver.development_shallow = @development_shallow
  resolver.ignore_dependencies = @ignore_dependencies
  resolver.soft_missing        = @soft_missing

  if @conservative
    installed_gems = {}
    Gem::Specification.find_all do |spec|
      (installed_gems[spec.name] ||= []) << spec
    end
    resolver.skip_gems = installed_gems
  end

  @resolver = resolver

  @requests = resolver.resolve

  @errors = set.errors

  @requests
end