type github.com/golang/protobuf/proto.extensionsByNumber

4 uses

	github.com/golang/protobuf/proto (current package)
		registry.go#L284: type extensionsByNumber = map[int32]*ExtensionDesc
		registry.go#L292: func RegisteredExtensions(m Message) extensionsByNumber {
		registry.go#L298: 	xs, _ := v.(extensionsByNumber)
		registry.go#L304: 	xs = make(extensionsByNumber)