type context.canceler

5 uses

	context (current package)
		context.go#L389: func removeChild(parent Context, child canceler) {
		context.go#L407: type canceler interface {
		context.go#L426: 	children map[canceler]struct{} // set to nil by the first cancel call
		context.go#L462: func (c *cancelCtx) propagateCancel(parent Context, child canceler) {
		context.go#L486: 				p.children = make(map[canceler]struct{})