deps/v8/src/js/messages.js
function GetColumnNumber(message) {
  var script = %MessageGetScript(message);
  var start_position = %MessageGetStartPosition(message);
  var location = script.locationFromPosition(start_position, true);
  if (location == null) return -1;
  return location.column;
}
function GetColumnNumber(message) {
  var script = %MessageGetScript(message);
  var start_position = %MessageGetStartPosition(message);
  var location = script.locationFromPosition(start_position, true);
  if (location == null) return -1;
  return location.column;
}
Returns the offset of the given position within the containing line.