use NativeCall;

sub mongo_connect( OpaquePointer $client, OpaquePointer $options)
    returns OpaquePointer
    is native('libmongoc')
  { ... }


my OpaquePointer $connection;
my OpaquePointer $options = OpaquePointer.new;
my $answer = mongo_connect($connection,pir::null__P());
'done'.say;