Tests/feaLib/data/bug453.fea

# https://github.com/behdad/fonttools/issues/453
feature mark {
    lookup mark1 {
        markClass [acute] <anchor 150 -10> @TOP_MARKS;
        pos base [e] <anchor 250 450> mark @TOP_MARKS;
    } mark1;
    lookup mark2 {
        markClass [acute] <anchor 150 -20> @TOP_MARKS_2;
        pos base [e] <anchor 250 450> mark @TOP_MARKS_2;
    } mark2;
} mark;