Gem::ConfigFile#load_file

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/config_file.rb, line 546
def load_file(filename)
  yaml_errors = [ArgumentError]

  return {} unless filename && !filename.empty? && File.exist?(filename)

  begin
    config = self.class.load_with_rubygems_config_hash(File.read(filename))
    has_invalid_keys = config.keys.any? {|k| k.to_s.gsub(%r{https?:\/\/}, "").include?(": ") }
    has_invalid_values = config.values.any? {|v| v.is_a?(String) && v.gsub(%r{https?:\/\/}, "").match?(/\A\S+: /) }
    if has_invalid_keys || has_invalid_values
      warn "Failed to load #{filename} because it doesn't contain valid YAML hash"
      return {}
    else
      return config
    end
  rescue *yaml_errors => e
    warn "Failed to load #{filename}, #{e}"
  rescue Errno::EACCES
    warn "Failed to load #{filename} due to permissions problem."
  end

  {}
end