code: function serializeLocationFields (location, content) {
    if (!location) {
      return;
    }
    content.position = location.position;
    var line = location.line;
    if (!IS_UNDEFINED(line)) {
      content.line = line;
    }
    var column = location.column;
    if (!IS_UNDEFINED(column)) {
      content.column = column;
    }
  }
docs: Serialize location information to the following JSON format:
  
  "position":"<position>",
  "line":"<line>",
  "column":"<column>",
  
  @param {SourceLocation} location The location to serialize, may be undefined.