case foo; in [*, x] then true; end

case foo; in [*x, y] then true; end

case foo; in [x, *, y] then true; end

case foo; in [x, *y, z] then true; end

case foo; in [x, y, *] then true; end

case foo; in [x, y, *z] then true; end

case foo; in [x, y,] then true; end

case foo; in [x, y] then true; end

case foo; in [x,] then nil; end

case foo; in [x] then nil; end