title: Can't import annotations from __future__
body: <p>When running the statement</p>
  
  <pre><code>from __future__ import annotations
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/lib/python3.5/py_compile.py", line 125, in compile
      _optimize=optimize)
    File "&lt;frozen importlib._bootstrap_external&gt;", line 735, in source_to_code
    File "&lt;frozen importlib._bootstrap&gt;", line 222, in _call_with_frames_removed
    File "./prog.py", line 1
      from __future__ import annotations
      ^
  SyntaxError: future feature annotations is not defined
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "&lt;string&gt;", line 1, in &lt;module&gt;
    File "/usr/lib/python3.5/py_compile.py", line 129, in compile
      raise py_exc
  py_compile.PyCompileError:   File "./prog.py", line 1
      from __future__ import annotations
                                       ^
  SyntaxError: future feature annotations is not defined
  </code></pre>
  
  <p>What could be the cause of this error?  </p>