[ruby-core:119419] [Ruby master Feature#20778] ruby/repl_type_completor as a bundled gem

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

Issue #20778 has been updated by hsbt (Hiroshi SHIBATA).

Status changed from Open to Assigned
Assignee set to hsbt (Hiroshi SHIBATA)

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Feature #20778: ruby/repl_type_completor as a bundled gem
https://bugs.ruby-lang.org/issues/20778#change-110033

* Author: tompng (tomoya ishida)
* Status: Assigned
* Assignee: hsbt (Hiroshi SHIBATA)
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When gem repl_type_completor is installed, `irb --type-completor` will provide better completion in IRB.
~~~
irb(main):001* [1, 2, 3].map(&:ch█
                             |:chr|
~~~

~~~
irb(main):001* [1, 2, 3].map(&:chr).each do |c|
irb(main):002*   puts c.ch█
irb(main):003> end   |c.chars |
                     |c.chomp |
                     |c.chomp!|
                     |c.chop  |
                     |c.chop! |
                     |c.chr   |
~~~

I believe this feature will provide powerful support especially to beginners, but it requires installation and setup. And what is important, you cannot activate this feature unless you know it exists.
If repl_type_completor is a bundled gem, and if IRB uses type-completor as default (https://github.com/ruby/irb/pull/1010), Ruby 3.4's IRB will provide great experience by default.

## With bundler
When `repl_type_completor` is not added to Gemfile, fallback to regexp-based completion.
Force require: consider later.

## Dependency
`prism` and `rbs`




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