Improve procedure macros (continued)

[fzyzcjy]

Cont. from #1676

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 59.53%. Comparing base (b36c3c8) to head (d3395b0).

❗ Current head d3395b0 differs from pull request most recent head 537c81f. Consider uploading reports for the commit 537c81f to get more accurate results

Files	Patch %	Lines
...n/generator/api_dart/spec_generator/class/field.rs	0.00%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1800       +/-   ##
===========================================
- Coverage   99.26%   59.53%   -39.74%     
===========================================
  Files         358      354        -4     
  Lines       15063    13156     -1907     
===========================================
- Hits        14953     7832     -7121     
- Misses        110     5324     +5214     

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