title: Why I have no warnings for mistyped class attribute?
body: <p>I have the following class:</p>
  <pre><code>class MyClass:
      my_attribute1: str
      my_attribute2: int
  
      def __init__(self):
          self.my_attribute1 = &quot;value&quot;
          self.my_attribute2 = &quot;10&quot; # got warning Expected type 'int', got 'str'... so it works as expected
          self.my_non_hinted_attribute = 100 # no warnings at all.
  </code></pre>
  <p>The non type hinted attribute could be a simple typo, so it seems I have no guarding warning for my typos... Using PyCharm with default settings.</p>
  <p><strong>Question</strong></p>
  <p>How can I achieve, that I get warning in case I make a typo in <code>self.attribute_name</code>?</p>