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gh-20476: Fix AssertionError (too many plugin hook passes) on dataclass attribute redefinition - #20521

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a12k:fix/dataclass-redef-crash

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gh-20476: Fix AssertionError (too many plugin hook passes) on dataclass attribute redefinition#20521
a12k wants to merge 3 commits into
python:masterfrom
a12k:fix/dataclass-redef-crash

Commits on Jan 4, 2026
- Fix crash in dataclass plugin when attribute is redefined
  
  Aaron Wieczorek
  authored and
  Aaron Wieczorek
  committed
  e4a5400
- Fix assert that was causing some unreachable code, failing some CI tests
  
  Aaron Wieczorek
  authored and
  Aaron Wieczorek
  committed
  01ba68a
- Defining local var inside loop, seems to be causing CI test issues
  
  Aaron Wieczorek
  authored and
  Aaron Wieczorek
  committed
  79839a0