https://git.ruby-lang.org/ruby.git/commit/?id=71fd26b195

From 71fd26b1957134588e150d1bfd7b831dc7864e8a Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 9 Aug 2019 01:43:51 +0900
Subject: Fallback for older Rubygems


diff --git a/test/rdoc/test_rdoc_rubygems_hook.rb b/test/rdoc/test_rdoc_rubygems_hook.rb
index 6007157..7d59577 100644
--- a/test/rdoc/test_rdoc_rubygems_hook.rb
+++ b/test/rdoc/test_rdoc_rubygems_hook.rb
@@ -132,8 +132,12 @@ class TestRDocRubygemsHook < Gem::TestCase https://github.com/ruby/ruby/blob/trunk/test/rdoc/test_rdoc_rubygems_hook.rb#L132
 
   def test_generate_default_gem
     Gem::Deprecate.skip_during do
-      @a.loaded_from =
-        File.join Gem.default_specifications_dir, 'a.gemspec'
+      if Gem.respond_to?(:default_specifications_dir)
+        klass = Gem
+      else
+        klass = Gem::Specification
+      end
+      @a.loaded_from = File.join klass.default_specifications_dir, 'a.gemspec'
     end
 
     @hook.generate
-- 
cgit v0.10.2


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