From: "luke-gru (Luke Gruber) via ruby-core" <ruby-core@...>
Date: 2023-01-16T03:59:54+00:00
Subject: [ruby-core:111822] [Ruby master Bug#19345] Class variable access from top-level inappropriate error

Issue #19345 has been reported by luke-gru (Luke Gruber).

----------------------------------------
Bug #19345: Class variable access from top-level inappropriate error
https://bugs.ruby-lang.org/issues/19345

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
I was looking at doing something like this:

```ruby
set_cvar = EnvUtil.labeled_class("SetCVar") do
  def self.set(val)
    @@a = val
  end
end
set_cvar.set(1) # fill write cache
set_cvar.freeze
set_cvar.set(2) # hit write cache, but should check frozen status
```

while working on a ruby issue (https://github.com/ruby/ruby/pull/7124) and I ran into an issue.
This code above gives the error "class variable access from toplevel (RuntimeError)"

Is this a bug or how it's supposed to work? The error is being raised in function `vm_get_cvar_base`.



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