type context.canceler

5 uses

	context (current package)
		context.go#L399: func removeChild(parent Context, child canceler) {
		context.go#L417: type canceler interface {
		context.go#L436: 	children map[canceler]struct{} // set to nil by the first cancel call
		context.go#L475: func (c *cancelCtx) propagateCancel(parent Context, child canceler) {
		context.go#L499: 				p.children = make(map[canceler]struct{})

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