feature f1 {
    sub A from [A.alt1 A.alt2];
    sub B from [B.alt1 B.alt2 B.alt3];
    sub C from [C.alt1];
} f1;


# Even if it has exactly the same content as feature f1,
# the lookup should not be shared.
feature f2 {
    sub A from [A.alt1 A.alt2];
    sub B from [B.alt1 B.alt2 B.alt3];
    sub C from [C.alt1];
} f2;