Clean up some suspicious code. There's no guarantee a constant of integer type is a ConstantInt, so it's not safe to just cast<> these to ConstantInt. (It could be a constant expression, for example) The code is shorter this way too :).

module mini.norun_debug2;

import tango.stdc.stdlib : rand;

void main()
{
    size_t iter;
    while (iter < 25)
    {
        if (rand() % 20 == 10)
            *cast(int*)null = 0;
        ++iter;
    }
    assert(0);
}