[ruby-core:122297] [Ruby Feature#21365] Add `Namespace#eval`

Issue #21365 has been updated by fxn (Xavier Noria).


`instance_eval` modifies the nesting in the eval'ed code. Since namespaces are modules, `instance_eval` already works:

```ruby
ns = Namespace.new
ns.instance_eval "p Module.nesting"
```

That prints `[Namespace]`.

I believe @tenderlove's wants a regular top-level execution context, where the nesting would be empty, in particular (mod https://bugs.ruby-lang.org/issues/21318).

----------------------------------------
Feature #21365: Add `Namespace#eval`
https://bugs.ruby-lang.org/issues/21365#change-113441

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
----------------------------------------
I would like a way to eval code on to a `Namespace` object. Could we add an eval method that _doesn't_ take a binding object?  Writing a new file every time I want to test Namespaces is too cumbersome.

Thanks!



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