Suppress bundled gem warning on `binding.irb'

This patch silences the "this won't work in the next version of Ruby"
warning displayed when irb is autoloaded via `binding.irb`.

    main.rb:1: warning: irb used to be loaded from the standard library, but is not part of the default gems since Ruby 4.0.0.
    You can add irb to your Gemfile or gemspec to fix this error.
    /.../irb.rb:9: warning: reline used to be loaded from the standard library, but is not part of the default gems since Ruby 4.0.0.
    You can add reline to your Gemfile or gemspec to fix this error.

    From: main.rb @ line 1 :

     => 1: binding.irb

    /.../input-method.rb:284: warning: rdoc used to be loaded from the standard library, but is not part of the default gems since Ruby 4.0.0.
    You can add rdoc to your Gemfile or gemspec to fix this error.

This warning is incorrect and misleading: users should not need to
include irb (and its dependencies) to their Gemfiles to use
`binding.irb`, even in future versions of Ruby. It is agreed that the
runtime takes care of that.

2 files changed, 9 insertions, 0 deletions

diff --git a/lib/bundled_gems.rb b/lib/bundled_gems.rb
index f6fdad21a1..85f23b2596 100644
--- a/lib/bundled_gems.rb
+++ b/lib/bundled_gems.rb
@@ -122,6 +122,10 @@ module Gem::BUNDLED_GEMS # :nodoc:
       false
     end
 
+    if suppress_list = Thread.current[:__bundled_gems_warning_suppression]
+      return if suppress_list.include?(name) || suppress_list.include?(feature)
+    end
+
     return if specs.include?(name)
 
     # Don't warn if a hyphenated gem provides this feature
diff --git a/prelude.rb b/prelude.rb
index 36da381804..249d0ecf7b 100644
--- a/prelude.rb
+++ b/prelude.rb
@@ -1,6 +1,9 @@
 class Binding
   # :nodoc:
   def irb(...)
+    suppress = Thread.current[:__bundled_gems_warning_suppression]
+    Thread.current[:__bundled_gems_warning_suppression] = ['irb', 'reline', 'rdoc']
+
     begin
       require 'irb'
     rescue LoadError, Gem::LoadError
@@ -8,6 +11,8 @@ class Binding
       require 'irb'
     end
     irb(...)
+  ensure
+    Thread.current[:__bundled_gems_warning_suppression] = suppress
   end
 
   # suppress redefinition warning