// ErrorHandlerSet sets the default error handler for errors that come
// into the main event loop. (This may be removed in the future in favor
// of a particular callback interface like events, but these sorts of errors
// aren't handled often in practice, so maybe not.)
// This is only called for errors returned from unchecked (asynchronous error
// handling) requests.
// The default error handler just emits them to stderr.
func ErrorHandlerSet(xu *xgbutil.XUtil, fun xgbutil.ErrorHandlerFun) {
xu.ErrorHandler = fun
}