public static object EachLine(BlockParam block, StringIO /*!*/ self, [DefaultProtocol] MutableString separator)
{
// TODO: improve MSOps.EachLine
var content = self.GetReadableContent();
var result = MutableStringOps.EachLine(block, content, separator, self._position);
return(ReferenceEquals(result, content) ? self : result);
}
