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

4 uses

	github.com/golang/protobuf/proto (current package)
		deprecated.go#L18: 	ErrNil = errors.New("proto: Marshal called with nil")
		wire.go#L34: 		return nil, ErrNil
		wire.go#L46: 			return buf, ErrNil

	github.com/golang/protobuf/ptypes
		any.go#L51: 			return nil, proto.ErrNil