Gem::Commands::SourcesCommand#configured_sources

# File tmp/rubies/ruby-4.0.0/lib/rubygems/commands/sources_command.rb, line 321
def configured_sources
  return @configured_sources if defined?(@configured_sources)

  configuration_sources = Gem.configuration.sources
  @configured_sources = Gem::SourceList.from(configuration_sources) if configuration_sources
end