TEST(ExistsMatchExpression, Equivalent) {
    ExistsMatchExpression e1;
    ExistsMatchExpression e2;
    e1.init("a").transitional_ignore();
    e2.init("b").transitional_ignore();

    ASSERT(e1.equivalent(&e1));
    ASSERT(!e1.equivalent(&e2));
}
TEST(ExistsMatchExpression, Equivalent) {
    ExistsMatchExpression e1;
    ExistsMatchExpression e2;
    e1.init("a").transitional_ignore();
    e2.init("b").transitional_ignore();

    ASSERT(e1.equivalent(&e1));
    ASSERT(!e1.equivalent(&e2));
}