Issue #15743 has been updated by naruse (Yui NARUSE).


As far as I remember, the name "RubyVM" is introduced because the name of the implementation which is called as CRuby or MRI cannot be decided, and also its VM's name is not actually YARV. To rename it to something, it needs to reopen the pandora box.

I think such topic will be just a bikeshed and shouldn't waste time.

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Feature #15743: RubyVM should be renamed to CRuby
https://bugs.ruby-lang.org/issues/15743#change-77530

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: Next Major
----------------------------------------
My understanding is that `RubyVM` is supposed to only exist on MRI/CRuby, and not on any other Ruby implementation.
In fact, almost all features under `RubyVM` are not realistically implementable on other major Ruby implementations (JRuby, TruffleRuby, Rubinius).

Unfortunately, the name doesn't reflect that it is specific to CRuby, e.g., JRuby/TruffleRuby/Rubinius are also "Ruby VMs".
And as a result it is not clear for many Ruby users that RubyVM is CRuby-specific.

The documentation is also unclear:
```
The RubyVM module provides some access to Ruby internals. This module is
for very limited purposes, such as debugging, prototyping, and research.
 Normal users must not use it.
```

So I propose to rename RubyVM to CRuby.
That way, it is clear for everyone that this module is CRuby-specific.
It's also consistent with the JRuby module, the TruffleRuby module and the Rubinius module.

Proposed migration path:

* Introduce CRuby as an alias of RubyVM on `trunk`, and deprecate the RubyVM constant on `trunk` (for 2.7).
* Remove `RubyVM` in Ruby 3.0.

What do you think?

cc @ko1 @k0kubun @headius



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