type google.golang.org/protobuf/reflect/protoregistry.extensionsByMessage

3 uses

	google.golang.org/protobuf/reflect/protoregistry (current package)
		registry.go#L480: 	extensionsByMessage extensionsByMessage
		registry.go#L489: 	extensionsByMessage map[protoreflect.FullName]extensionsByNumber
		registry.go#L563: 		r.extensionsByMessage = make(extensionsByMessage)