title: Visual Studio 17.3 warnings don't make sense
body: <p>Visual Studio tries to give me directions on what mistakes I might be making.
  Very nice, but with each update, more warnings appear I can't make heads or tails of.
  Look at the warning below:
  <a href="https://i.stack.imgur.com/Jpb4A.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Jpb4A.png" alt="enter image description here" /></a></p>
  <p>Each and every reference to some item (variable, function) gets a red underlining with these warnings. &quot;Not null&quot;? I hope so! &quot;Ambiguity&quot;? With what? Itself?</p>
  <p>Options? (And no, better not disabling the warnings. I don't want to miss real mistakes)</p>