type runtime.mSpanStateBox

4 uses

	runtime (current package)
		mheap.go#L401: type mSpanStateBox struct {
		mheap.go#L408: func (b *mSpanStateBox) set(s mSpanState) {
		mheap.go#L416: func (b *mSpanStateBox) get() mSpanState {
		mheap.go#L510: 	state                 mSpanStateBox // mSpanInUse etc; accessed atomically (get/set methods)