fix: checker generator for nested types

[kjubybot]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.86%. Comparing base (5128691) to head (17597c5).
Report is 149 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2167      +/-   ##
==========================================
- Coverage   59.67%   57.86%   -1.82%     
==========================================
  Files         254      261       +7     
  Lines        5285     5757     +472     
==========================================
+ Hits         3154     3331     +177     
- Misses       2131     2426     +295     

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