stack2.pop(); // 弹出无效的候选值
For transforms that need cleanup on abort, add an abort handler:
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Tommy Schaefer was sentenced to 18 years in prison in Bali for the 2014 murder of Sheila von Wiese-Mack, the mother of Heather Mack, during a luxury holiday, in a case that became known as the Bali suitcase murder. Prosecutors allege the couple were trying to gain access to a $1.5m (£1.1m) trust fund.
Adam EleyBBC News