[ruby-core:112024] [Ruby master Bug#19341] Write cache issue with class variables

25 Jan 2023

      Issue #19341 has been updated by naruse (Yui NARUSE).

This breaks CI on ruby_3_2 branch https://github.com/nurse/ruby/commit/ec9a6ae3f6961b0ece1a6fc67ea26033ee91498...

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Bug #19341: Write cache issue with class variables
https://bugs.ruby-lang.org/issues/19341#change-101456

* Author: luke-gru (Luke Gruber)
* Status: Closed
* Priority: Normal
* Backport: 2.7: DONTNEED, 3.0: DONTNEED, 3.1: DONTNEED, 3.2: REQUIRED
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``` ruby
class SetCvar
  def self.set(val)
    @@a = val # inline cache
  end
end

def test_set_cvar_on_frozen_object
  SetCvar.set(1) # fill write cache
  SetCvar.freeze
  SetCvar.set(2) # hit write cache, but should check frozen status
end

test_set_cvar_on_frozen_object()
```

PR Here: https://github.com/ruby/ruby/pull/7124

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