Try a bit harder to find types for look-ahead completion
We now look at the return type of functions we complete, instead of just adding the functions themselves. This sounds like a valid approach but in the end isn't sufficient to solve all cases - we really need to expand the libclang API to get this done properly. Most notably, since self-assignment isn't allowed anymore, we cannot find the correct type for the `int* p = ...` case anymore and just fail then... For now, we will mark the test as an expected failure.
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