main() {
    let a1: address;
    let a2: address;
    let a3: address;
    let a4: address;
    let a5: address;
    let a6: address;
    let a7: address;
    let a8: address;
    let a9: address;

    a1 = 0x1;
    a2 = 0x01;
    a3 = 0x0001;
    a4 = 0x00000001;
    a5 = 0x0000000000000001;
    a6 = 0x00000000000000000000000000000001;
    a7 = 0x000000000000000000000000000000001;
    a8 = 0x000000000000000000000000000000000000000000000000000000000000001;
    a9 = 0x0000000000000000000000000000000000000000000000000000000000000001;

    assert(copy(a1) == copy(a2), 42);
    assert(copy(a2) == copy(a3), 43);
    assert(copy(a3) == copy(a4), 44);
    assert(copy(a4) == copy(a5), 45);
    assert(copy(a5) == copy(a6), 46);
    assert(copy(a6) == copy(a7), 47);
    assert(copy(a7) == copy(a8), 48);
    assert(copy(a8) == copy(a9), 49);
    return;
}