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.

// Based on dstress.run.t.tuple_15_A;

module tuple_and_vararg;

template TypeTuple(TList...){
	alias TList TypeTuple;
}

void main(){
	auto y = function(TypeTuple!(uint,uint) ab, ...){};
        y(1, 2);
        y(1, 2, "foo", 3.0);
}