classfile support auto-generated clone

[xushiwei]

#2177

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.12%. Comparing base (b0affac) to head (50d1bdb).
Report is 10 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2178   +/-   ##
=======================================
  Coverage   93.12%   93.12%           
=======================================
  Files          34       34           
  Lines       11024    11090   +66     
=======================================
+ Hits        10266    10328   +62     
- Misses        603      606    +3     
- Partials      155      156    +1     

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