package time
import "errors"
// A Ticker holds a channel that delivers `ticks' of a clock
// at intervals.
type Ticker struct {
C <-chan Time // The channel on which the ticks are delivered.
r runtimeTimer
}
刚刚翻到time源码，声明了一个通道，原来如此，但是为什么这样使用<-t.C使用？没有接收者呀？
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