Merge bundler to standard libraries.

  rubygems 2.7.x depends bundler-1.15.x. This is preparation for
  rubygems and bundler migration.

  * lib/bundler.rb, lib/bundler/*: files of bundler-1.15.4
  * spec/bundler/*: rspec examples of bundler-1.15.4. I applied patches.
    * https://github.com/bundler/bundler/pull/6007
    * Exclude not working examples on ruby repository.
    * Fake ruby interpriter instead of installed ruby.
  * Makefile.in: Added test task named `test-bundler`. This task is only
    working macOS/linux yet. I'm going to support Windows environment later.
  * tool/sync_default_gems.rb: Added sync task for bundler.

  [Feature #12733][ruby-core:77172]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 32 insertions, 0 deletions

diff --git a/lib/bundler/deprecate.rb b/lib/bundler/deprecate.rb
new file mode 100644
index 0000000000..b978c0df6c
--- /dev/null
+++ b/lib/bundler/deprecate.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+module Bundler
+  if defined? ::Deprecate
+    Deprecate = ::Deprecate
+  elsif defined? Gem::Deprecate
+    Deprecate = Gem::Deprecate
+  else
+    class Deprecate; end
+  end
+
+  unless Deprecate.respond_to?(:skip_during)
+    def Deprecate.skip_during
+      original = skip
+      self.skip = true
+      yield
+    ensure
+      self.skip = original
+    end
+  end
+
+  unless Deprecate.respond_to?(:skip)
+    def Deprecate.skip
+      @skip
+    end
+  end
+
+  unless Deprecate.respond_to?(:skip=)
+    def Deprecate.skip=(skip)
+      @skip = skip
+    end
+  end
+end