type runtime.mSpanStateBox

4 uses

	runtime (current package)
		mheap.go#L376: type mSpanStateBox struct {
		mheap.go#L383: func (b *mSpanStateBox) set(s mSpanState) {
		mheap.go#L391: func (b *mSpanStateBox) get() mSpanState {
		mheap.go#L486: 	state                 mSpanStateBox // mSpanInUse etc; accessed atomically (get/set methods)