type runtime.mapextra

6 uses

	runtime (current package)
		map.go#L129: 	extra *mapextra // optional fields
		map.go#L133: type mapextra struct {
		map.go#L276: 		h.extra = new(mapextra)
		map.go#L331: 			h.extra = new(mapextra)
		map.go#L1020: 		*h.extra = mapextra{}
		map.go#L1073: 			h.extra = new(mapextra)