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.
// 优化点：仅i<len时赋值（避免重复赋值，提升效率）
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Трамп высказался о непростом решении по Ирану09:14