var context.closedchan

4 uses

	context (current package)
		context.go#L378: 	if done == closedchan || done == nil {
		context.go#L417: var closedchan = make(chan struct{})
		context.go#L420: 	close(closedchan)
		context.go#L556: 		c.done.Store(closedchan)

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