[ruby-core:74101] [Ruby trunk Feature#12138] Support `Kernel#load_with_env(filename, cbase: SomeMod, cref: someMod, binding: SomeMod) # => obj`

Issue #12138 has been reported by Josh Cheek.

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Feature #12138: Support `Kernel#load_with_env(filename, cbase: SomeMod, cref: someMod, binding: SomeMod) # => obj`
https://bugs.ruby-lang.org/issues/12138

* Author: Josh Cheek
* Status: Open
* Priority: Normal
* Assignee: 
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Ruby's `require` and `load` methods currently only return `true`, which means that any code being loaded must affect the global namespace, or have the global namespace affected for it to interact with.

This means that to load data, like a gemspec, you have to read the file in and eval it:
* [Rubygems](https://github.com/ruby/ruby/blob/0534b970bc83814e77ea4bd8ba9b2d31fefc9b1e/lib/rubygems/specification.rb#L1164)
* [Bundler](https://github.com/bundler/bundler/blob/5e2e2ff089af4875c54b27cfb5d4286471dff125/lib/bundler.rb#L395)

To load a plugin or configuration, you have to modify a global object:
* [Railties](https://github.com/rails/rails/blob/e2f08a1c0a9d1dc2f27d1dfcd3c9937f4190554a/railties/lib/rails/engine.rb#L356-#L358) hook into subclassing
* [RSpec](https://github.com/rspec/rspec-core/blob/f54edeed49799042b8fffddb278466fb7185314e/lib/rspec/core/dsl.rb#L37-L47) tests have to be declared to a global object
* [Minitest](https://github.com/seattlerb/minitest/blob/baf6010053279f75f561f6a599d8837151327588/lib/minitest.rb#L262-L265), too
* [Rake](https://github.com/ruby/rake/blob/7c9014e5559e846e9ffee1cf1584c4454374dd70/lib/rake/dsl_definition.rb#L194) extends main to store results on a [global object](https://github.com/ruby/rake/blob/7c9014e5559e846e9ffee1cf1584c4454374dd70/lib/rake/dsl_definition.rb#L58-#L60)

It's why gems have to be built the way they do, to avoid colliding with other code in the global namespace (fwiw, I've seen a computer segfault when the person unwittingly write their own Queue class). Which is also why we can't load multiple versions of a gem in the same namespace.



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