Make == for associative arrays test for equality, not identity. _aaEq was added to runtime/internal/aaA.d which forwards to TypeInfo_AssociativeArray.equals in genobj.d. On the codegen side, DtoAAEquals was added to gen/aa.cpp and is called from EqualExp::toElem in gen/toir.cpp. I assume that the frontend will produce an error if == is used on associative arrays of different type. This fixes DMD bug 1429.

module tangotests.align1;

extern(C) int printf(char*, ...);

struct TLA
{
    char[3] tla;
    char[] toString() { return tla; }
    void dump()
    {
        printf("%.*s\n", 3, tla.ptr);
    }
}

void main()
{
    TLA fbi = TLA("FBI");
    fbi.dump();
}