[ruby-core:122294] [Ruby Feature#21365] Add `Namespace#eval`

Issue #21365 has been updated by Eregon (Benoit Daloze).


`ns.eval "self"` would be the Namespace "main" object, not the `Namespace` instance itself, so `instance_eval` would be a bad fit here.

AFAIK, `instance_eval` is only called as such because any `def foo; end` inside it will definite a singleton method on the instance.
And similarly `class_eval` defines `def foo; end` as a class instance method.
This is not relevant here, `def foo; end` would have normal top-level `def` semantics (in that namespace).

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Feature #21365: Add `Namespace#eval`
https://bugs.ruby-lang.org/issues/21365#change-113438

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
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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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