Gem.default_gem_load_paths

# File tmp/rubies/ruby-4.0.0/lib/rubygems.rb, line 1374
def default_gem_load_paths
  @default_gem_load_paths ||= $LOAD_PATH[load_path_insert_index..-1].map do |lp|
    expanded = File.expand_path(lp)
    next expanded unless File.exist?(expanded)

    File.realpath(expanded)
  end
end