From: "tenderlovemaking (Aaron Patterson) via ruby-core" <ruby-core@...>
Date: 2025-07-30T23:25:20+00:00
Subject: [ruby-core:122883] [Ruby Bug#21522] Accessing outer locals via eval in a Ractor returns false

Issue #21522 has been reported by tenderlovemaking (Aaron Patterson).

----------------------------------------
Bug #21522: Accessing outer locals via eval in a Ractor returns false
https://bugs.ruby-lang.org/issues/21522

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Assignee: ractor
* ruby -v: ruby 3.5.0dev (2025-07-28T22:17:45Z master f1acf47ca2) +PRISM [arm64-darwin24]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
Normally, if you try to access a local that's been defined outside the scope of the Ractor block, it'll raise an ArgumentError.  However, if you try to access the local via `eval` it will return the value `false`.

```ruby
foo = Object.new

begin
  Ractor.new {
    p foo
  }.value
rescue ArgumentError
end

Ractor.new {
  p eval("foo") # => false
}.value
```

I'm not sure how we fix this, since my guess is that we zero the environment when copying, but I wanted to file the issue so we can track it.



-- 
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