import "package:ffi/ffi.dart";
import 'dart:ffi';

class Coordinate extends Struct {
  external Pointer<Coordinate> next;
  @Double()
  external double x;
  @Double()
  external double y;
  factory Coordinate.allocate(
      Allocator allocator, double x, double y, Pointer<Coordinate> next) {}
}

main() {}