Point(1) = {0,0,0,0.5};
Point(2) = {1,0,0,0.5};
Point(3) = {-1,0,0,0.5};
Circle(1) = {2,1,3};
Circle(2) = {3,1,2};
Line Loop(3) = {2,1};
Plane Surface(4) = {3};
Extrude {0,0,1} {
  Surface{4};
}
