I've landed bug 1494765, which allows you to do assignments between
nsCOMPtrs for classes that are related by subtyping.
For instance:
class A { ... ];
class B : public A { ... };
nsCOMPtr<B> b = ...;
nsCOMPtr<A> a = b; // this works now
This is a step towards bug 1493226, which is going to statically ban
trivial do_QueryInterface calls like this:
nsCOMPtr<A> a2 = do_QueryInterface(b);
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