// 栈不为空时才判断（避免访问stack.at(-1)时报错）
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，更多细节参见搜狗输入法2026
composefs on / type overlay (ro,relatime,seclabel,lowerdir+=/run/ostree/.private/cfsroot-lower,datadir+=/sysroot/ostree/repo/objects,redirect_dir=on,metacopy=on)
enhancements like Green Tea, the garbage collector