[ruby-core:116983] [Ruby master Feature#20309] Bundled gems for Ruby 3.5

["hsbt (Hiroshi SHIBATA) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20309 has been reported by hsbt (Hiroshi SHIBATA).

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Feature #20309: Bundled gems for Ruby 3.5
https://bugs.ruby-lang.org/issues/20309

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Assignee: hsbt (Hiroshi SHIBATA)
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I propose migrate the following default gems to bundled gems at Ruby 3.5. So, It means users will get warnings if users try to load them. 

* ostruct
* irb
* reline
* readline (wrapper file for readline-ext and reline)
* io-console
* logger
* fiddle
* pstore
* open-uri
* yaml (wrapper file for psych)
* win32ole

I have a plan to migrate the following default gems too. But I need to more feedback from other committers about them.

* rdoc
	* We need to change build task like download rdoc gem before document generation.
	* or We make document generation is optional from Ruby 3.5
		* We explicitly separate `make install` and `make install-doc`
* un
	* `ruby -run` is one of cool feature of Ruby. Should we avoid uninstalling `un` gem?
* singleton
	* This is famous design pattern. Should we enforce users add them to their Gemfile?
* forwadable
	* `reline` needs to add forwardable their `runtime_dependency` after migration.
* weakref
	* I'm not sure how impact after migrating bundled gems.
* fcntl
	* Should we integrate these constants into ruby core?

I would like to migrate `ipaddr` and `uri` too. But these are used by webrick that is mock server for our test suite. We need to rewrite `webrick` with `TCPSocker` or extract `ipaddr` and `uri` dependency from `webrick`

Other default gems depend on our build process or other libraries deeply.  I will update this proposal if I could extract them from default gems.



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