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Browse the implementors of #beVariable message and you will find other filters under BPatternVariableNode class, such as #beInstVar or #beLocalVar. If you miss something, just add a method. No new syntax required.
。关于这个话题，safew官方版本下载提供了深入分析
Joe FayTechnology Reporter
（二）享有政治权利，人身自由未受到限制；
"We've banned unfair bonuses, secured record levels of investment and introduced landmark legislation to hold water companies to account – including jail time for water company executives who obstruct investigations."