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.

// adapted from dstress.run.a.associative_array_19_<n> to catch regressions early

module mini.aa7;

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


int main(){
    char*[char] aa;

    char key = 'a';
    aa[key] = &key;
    gc_collect();
    assert(aa[key] == &key);
    assert(key in aa);

    return 0;
}