code: def _install_yarnpkg(self):
      
      yarnpkg_package_path = YarnpkgDistribution.scoped_instance(self).select()
      yarnpkg_bin_path = os.path.join(yarnpkg_package_path, 'dist', 'bin')
      return yarnpkg_bin_path
docs: Install the Yarnpkg distribution from pants support binaries.
  
      :returns: The Yarnpkg distribution bin path.
      :rtype: string