我遇到了这样的功能(为清楚起见进行了简化):func myfunc(ir io.RuneReader, ib []byte, is string, pos, ncap int, dstCap []int) []int {var matched bool// do something to get matched, change dstCapReturn: if !matched { return nil } return dstCap}'Return:' 行是什么意思?
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