dev = usb.core.find(idVendor=0x0694, idProduct=0x0002)
ld-options: -Wl,--icf=all,--ignore-data-address-equality,--ignore-function-address-equality,--print-icf-sections
,这一点在QQ音乐下载中也有详细论述
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Previous position: 3
while ((r = result) == null) {