[ anyVar isNil ifTrue: anyBlock ] bpattern with: [ anyVar ] -> [:pattern | pattern beVariable ]
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，详情可参考safew官方下载
UPDATE: Solutions can be read here
我們需要對AI機器人保持禮貌嗎？，详情可参考91视频
What this means for namespace-guard，这一点在爱思助手下载最新版本中也有详细论述
can’t be allocated on the stack, because the stack frame for extract