promql/lex.go
func lexSpace(l *lexer) stateFn {
	for isSpace(l.peek()) {
		l.next()
	}
	l.ignore()
	return lexStatements
}
func lexSpace(l *lexer) stateFn {
	for isSpace(l.peek()) {
		l.next()
	}
	l.ignore()
	return lexStatements
}
// lexSpace scans a run of space characters. One space has already been seen.