var google.golang.org/grpc/internal.GetServerCredentials

2 uses

	google.golang.org/grpc/internal (current package)
		internal.go#L60: 	GetServerCredentials interface{} // func (*grpc.Server) credentials.TransportCredentials

	google.golang.org/grpc
		server.go#L70: 	internal.GetServerCredentials = func(srv *Server) credentials.TransportCredentials {