error for unnamed fields

[mathause]

Parsing names with unnamed fields does not work at the moment. We could also fix this but raise an error for now.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.85%. Comparing base (4b637a3) to head (820932b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   88.73%   88.85%   +0.11%     
==========================================
  Files           5        5              
  Lines         293      296       +3     
==========================================
+ Hits          260      263       +3     
  Misses         33       33              

Flag	Coverage Δ
unittests	88.85% <100.00%> (+0.11%)	⬆️

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