https://git.ruby-lang.org/ruby.git/commit/?id=526c9359ca

From 526c9359cae8226608a566f414f04b2c6a204d81 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?David=20Rodr=C3=ADguez?= <deivid.rodriguez@r...>
Date: Mon, 29 Nov 2021 18:18:24 +0100
Subject: [rubygems/rubygems] Don't cleanup paths from gems already activated
 from `$LOAD_PATH`

This way, if some default gem has been required before bundler, and
rubygems has enhanced the `$LOAD_PATH` to use the latest version in the
system, further requires of that default gem after bundler has been
activated will use the same version and don't cause redefinition
warnings or worse problems derived from the fact of mixing up two
different versions. That, unless the gem is a `Gemfile` dependency. In
that case, we'll get a mismatch error anyways as we do now.

This fix doesn't mean that all default gems internally used by
bundler/rubygems are now supported inside `Gemfile`'s. That should be
handled case by case, but it will now bite people only when they try to
add the gem to their `Gemfile`, not before.

https://github.com/rubygems/rubygems/commit/7325530547
---
 lib/bundler/shared_helpers.rb      |  5 ++---
 spec/bundler/runtime/setup_spec.rb | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/lib/bundler/shared_helpers.rb b/lib/bundler/shared_helpers.rb
index 405ade95ddf..846b9cc3aa4 100644
--- a/lib/bundler/shared_helpers.rb
+++ b/lib/bundler/shared_helpers.rb
@@ -313,12 +313,11 @@ module Bundler https://github.com/ruby/ruby/blob/trunk/lib/bundler/shared_helpers.rb#L313
     end
 
     def clean_load_path
-      bundler_lib = bundler_ruby_lib
-
       loaded_gem_paths = Bundler.rubygems.loaded_gem_paths
 
       $LOAD_PATH.reject! do |p|
-        next if resolve_path(p).start_with?(bundler_lib)
+        resolved_path = resolve_path(p)
+        next if $LOADED_FEATURES.any? {|lf| lf.start_with?(resolved_path) }
         loaded_gem_paths.delete(p)
       end
       $LOAD_PATH.uniq!
diff --git a/spec/bundler/runtime/setup_spec.rb b/spec/bundler/runtime/setup_spec.rb
index 804e29c3c13..35873dcaa96 100644
--- a/spec/bundler/runtime/setup_spec.rb
+++ b/spec/bundler/runtime/setup_spec.rb
@@ -1511,5 +1511,28 @@ end https://github.com/ruby/ruby/blob/trunk/spec/bundler/runtime/setup_spec.rb#L1511
 
       expect(out).to include("rack, yard")
     end
+
+    it "does not cause double loads when higher versions of default gems are activated before bundler" do
+      build_repo2 do
+        build_gem "json", "999.999.999" do |s|
+          s.write "lib/json.rb", <<~RUBY
+            module JSON
+              VERSION = "999.999.999"
+            end
+          RUBY
+        end
+      end
+
+      system_gems "json-999.999.999", :gem_repo => gem_repo2
+
+      install_gemfile "source \"#{file_uri_for(gem_repo1)}\""
+      ruby <<-RUBY
+        require "json"
+        require "bundler/setup"
+        require "json"
+      RUBY
+
+      expect(err).to be_empty
+    end
   end
 end
-- 
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