client declared and not used compilation error, after recent upgrade

[c4milo]

I'm getting compilation errors with the latest changes.

...
// RegisterAuthzHandler registers the http handlers for service Authz to "mux".
// The handlers forward requests to the grpc endpoint over "conn".
func RegisterAuthzHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc.ClientConn) error {
	client := NewAuthzClient(conn)

	return nil
}

var ()

var ()
...

...
service Authz {
	rpc SignIn (SignInRequest) returns (SignInResponse) {}
	rpc SignOut (SignOutRequest) returns (SignOutResponse) {}
}
...

[c4milo]

I can confirm 199c40a to be the culprit