feature f1 {
    sub c_t by c t;
    sub f_i by f i;
    sub f_f_i by f f i;
} f1;


# Exact same content as feature f1; lookup should be shared.
feature f2 {
    sub c_t by c t;
    sub f_i by f i;
    sub f_f_i by f f i;
} f2;