var github.com/golang/protobuf/proto.extensionCache

3 uses

	github.com/golang/protobuf/proto (current package)
		registry.go#L286: var extensionCache sync.Map // map[messageName]extensionsByNumber
		registry.go#L297: 	v, _ := extensionCache.Load(s)
		registry.go#L315: 	extensionCache.Store(s, xs)