Fixed #679: Better support for coroutines with return_void.

[andreasfertig]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.86%. Comparing base (cc5b06c) to head (4ab16a1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #688   +/-   ##
=======================================
  Coverage   97.86%   97.86%           
=======================================
  Files          20       20           
  Lines        6550     6550           
=======================================
  Hits         6410     6410           
  Misses        140      140           

Flag	Coverage Δ
insights-macos	97.13% <100.00%> (ø)
insights-ubuntu-amd64-libcxx-No	98.10% <100.00%> (ø)
insights-ubuntu-amd64-libcxx-Yes	98.08% <100.00%> (ø)
insights-ubuntu-arm64-libcxx-No	98.06% <100.00%> (ø)
insights-ubuntu-arm64-libcxx-Yes	98.04% <100.00%> (ø)

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