[ruby-core:111832] [Ruby master Bug#19345] Class variable access from top-level inappropriate error

Issue #19345 has been updated by Eregon (Benoit Daloze).

Status changed from Open to Closed

Class variables work similar to constants in terms of lookup, they only use the scopes opened by `class Name/module Name/class << expr`.
`module_{eval,exec}/class_{eval,exec}` do not change that scope.
So this is expected, `EnvUtil.labeled_class` doesn't change the scope for constants & class variables.

----------------------------------------
Bug #19345: Class variable access from top-level inappropriate error
https://bugs.ruby-lang.org/issues/19345#change-101241

* Author: luke-gru (Luke Gruber)
* Status: Closed
* 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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