"Unsigned-related bugs never occur in real code."

[Andrei Alexandrescu]

"It's an academic problem. Don't worry about it and move on."
That's what Walter kept on telling me. Yet I've spent the better part of 
an hour reducing a bug down to the following:

import std.math, std.stdio;

void main() {
    auto a = [ 4, 4, 2, 3, 2 ];
    float avgdist = 0;
    uint count;

    foreach (i, e1; a) {
        foreach (j, e2; a) {
            if (i == j) continue;
            if (e1 != e2) continue;
            ++count;
            avgdist += abs(i - j);
        }
    }

    writeln(count, " ", avgdist / count);
}

May this post be an innocent victim of the war against unsigned-related 
bugs.


Andrei