Raise error for invalid value in return annotation.

[tobiasraabe]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2bd471f) 96.41% compared to head (ce75347) 96.41%.

❗ Current head ce75347 differs from pull request most recent head 480fc4b. Consider uploading reports for the commit 480fc4b to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #488   +/-   ##
=======================================
  Coverage   96.41%   96.41%           
=======================================
  Files         104      104           
  Lines        8862     8870    +8     
=======================================
+ Hits         8544     8552    +8     
  Misses        318      318           

Flag	Coverage Δ
end_to_end	82.50% <33.33%> (-0.06%)	⬇️
integration	40.43% <22.22%> (+<0.01%)	⬆️
unit	67.83% <100.00%> (+0.02%)	⬆️

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Files	Coverage Δ
src/_pytask/collect.py	94.28% <100.00%> (+0.08%)	⬆️
tests/test_collect.py	97.43% <100.00%> (+0.04%)	⬆️

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