[ruby-core:119894] [Ruby master Feature#20884] reserve "Ruby" toplevel module for Ruby language

["Dan0042 (Daniel DeLorme) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20884 has been updated by Dan0042 (Daniel DeLorme).

Description updated

Eregon (Benoit Daloze) wrote in #note-3:
> I'd suggest to update the description to use `Ruby::VERSION`).

Ok, did that.

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Feature #20884: reserve "Ruby" toplevel module for Ruby language
https://bugs.ruby-lang.org/issues/20884#change-110598

* Author: Dan0042 (Daniel DeLorme)
* Status: Open
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`Ruby` would be a convenient namespace for many features of the Ruby language, in particular APIs related to the interpreter.

All these constants:

	RUBY_VERSION
	RUBY_RELEASE_DATE
	RUBY_PLATFORM
	RUBY_PATCHLEVEL
	RUBY_REVISION
	RUBY_COPYRIGHT
	RUBY_ENGINE
	RUBY_ENGINE_VERSION
	RUBY_DESCRIPTION
	
would have made a lot of sense as `Ruby::VERSION` etc.

`Thread::Backtrace::Location` would have made a lot of sense as `Ruby::Backtrace::Location`

`RubyVM` is considered specific to CRuby; so `RubyVM::AbstractSyntaxTree` should be `Ruby::AbstractSyntaxTree` if it is meant to be present in other implementations.

In #6648 there's a bit of contention over where `ruby_args` should be. `RubyVM`, `RbConfig`, `Process` have all been proposed, but `Ruby` would be an excellent choice.

`Process.argv0` was added in Ruby 2.1 but the `Process` namespace is really about OS-level process control (fork, signals, euid, limits) while this argv0 is not (in `ps` it's neither value of COMMAND nor CMD) so it would have made sense as `Ruby.argv0`

The "ruby" gem name is reserved, so there's no conflict. https://rubygems.org/gems/ruby

All in all, "Ruby" is an appropriate namespace for many Ruby things. We don't want to break compatibility over this, but we could at least start small by reserving the namespace, and see how it grows from there.

	module Ruby
	  VERSION = ::RUBY_VERSION
	end




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