var context.cancelCtxKey

7 uses

	context (current package)
		context.go#L289: 	if cc, ok := c.Value(&cancelCtxKey).(*cancelCtx); ok {
		context.go#L374: var cancelCtxKey int
		context.go#L387: 	p, ok := parent.Value(&cancelCtxKey).(*cancelCtx)
		context.go#L442: 	if key == &cancelCtxKey {
		context.go#L784: 			if key == &cancelCtxKey {
		context.go#L789: 			if key == &cancelCtxKey {
		context.go#L796: 			if key == &cancelCtxKey {

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)