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 moduleinfo2;

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

void main()
{
    printf("listing modules:\n");
    foreach(m; ModuleInfo)
    {
        printf("  %.*s\n", m.name.length, m.name.ptr);
    }
}