If you're a python programmer, the PyCharm IDE can  use Python 3 function annotations to do type suggestions and warnings.
I made this little animation to demonstrate.
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PyCharm with type annotations – Gfycat
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I love PyCharm.
I had been using Pycharm in all my python programs.
Is this demo'ing the community version or the paid version of pycharm?  Any particular release level?
This is on the latest paid version.
Sublime Text ftw
+David Manson , this is PyCharm, not Sublime Text
I wish Sublime Text could do this…