}

// at marks the state to be on node n, for error reporting.
func (s *state) at(node parse.Node) {
	s.node = node
}

// doublePercent returns the string with %'s replaced by %%, if necessary,
// so it can be used safely inside a Printf format string.
func doublePercent(str string) string {
	return strings.ReplaceAll(str, "%", "%%")
}

// TODO: It would be nice if ExecError was more broken down, but