ArrayBoundsError for associative array operation

[Egor Starostin]

I have a testcase (simplified from real data) when access to
associative array by existing key produces ArrayBoundsError.

Here it is:
***
import std.stdio;
void main() {
    struct SKey {
        int dep;
        char[] hv;
        uint toHash() {
            uint hkey;
            for (int i=0;i<hv.length;i++) {
                hkey = hkey*10 + (hv[i]-'0');
            }
            return hkey + dep;
        }
    }
    int[SKey] aa;
    SKey ck;

// populate aa (in that exact order)
    ck.dep=0; ck.hv="1236448822";
    aa[ck] = 1;
    ck.dep=0; ck.hv="2716102924";
    aa[ck] = 1;
    ck.dep=0; ck.hv="315901071";
    aa[ck] = 1;

// remove one key
    ck.dep=0; ck.hv="1236448822";
    aa.remove(ck);

// get an error ArrayBoundsError
// while trying to access by one of remaining keys
    ck.dep=0; ck.hv="2716102924";
    writefln(aa[ck]);
}
***

Why I get an ArrayBoundsError for existing key?
Is this a bug in D? If yes -- can somebody suggest a workaround?


--
Egor