Handle type annotations

[gleber]

I've tried adding type annotations to parser and I was getting

TypeError: 'ForwardDeclaration' object does not support item assignment

This PR fixes it by ignoring annotations, which is likely wrong. I'd be happy to improve the solution.

[drhagen]

Thank you for your contribution. I will accept it with minor changes.

[gleber]

Suggestions applied. PTAL

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (94d7c9f) to head (af12132).

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #123   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           25        25           
  Lines          809       811    +2     
  Branches        86        87    +1     
=========================================
+ Hits           809       811    +2     

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