func IsOverQuota(err error) bool {
	callErr, ok := err.(*internal.CallError)
	return ok && callErr.Code == 4
}
func IsOverQuota(err error) bool {
	callErr, ok := err.(*internal.CallError)
	return ok && callErr.Code == 4
}
func IsOverQuota ( err error ) bool { callErr , ok := err . ( * internal . CallError ) return ok && callErr . Code == 4 }
// IsOverQuota reports whether err represents an API call failure
// due to insufficient available quota.
IsOverQuota reports whether err represents an API call failure due to insufficient available quota .