type runtime.mapextra

6 uses

	runtime (current package)
		map.go#L128: 	extra *mapextra // optional fields
		map.go#L132: type mapextra struct {
		map.go#L275: 		h.extra = new(mapextra)
		map.go#L330: 			h.extra = new(mapextra)
		map.go#L1007: 		*h.extra = mapextra{}
		map.go#L1060: 			h.extra = new(mapextra)