[rubygems/rubygems] Allow using `Gem::Version` without loading the rest of rubygems

https://github.com/rubygems/rubygems/commit/1b862537a5

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/rubygems/version.rb b/lib/rubygems/version.rb
index 20bbff4fdd..37fd71edc0 100644
--- a/lib/rubygems/version.rb
+++ b/lib/rubygems/version.rb
@@ -149,6 +149,15 @@
 # For the last example, single-digit versions are automatically extended with
 # a zero to give a sensible result.
 
+# Our code style opens classes directly without opening the intermediate
+# modules. This works because tha main entrypoint `rubygems.rb`, which defines
+# the root `Gem` module, is usually required first. But in this case we want to
+# allow using `Gem::Version` without loading the rest of rubygems, so we
+# explicit define the `Gem` placeholder module first.
+module Gem; end
+
+require_relative "deprecate"
+
 class Gem::Version
   autoload :Requirement, File.expand_path('requirement', __dir__)