[rubygems/rubygems] Cleaner extension of Gem::Specification to be able to set source

ruby/rubygems@3749273ec6

Author: deivid-rodriguez

lib/bundler/rubygems_ext.rb

@@ -81,12 +81,16 @@ class Specification
 
     attr_accessor :remote, :relative_loaded_from
 
-    remove_method :source
-    attr_writer :source
-    def source
-      (defined?(@source) && @source) || Gem::Source::Installed.new
+    module AllowSettingSource
+      attr_writer :source
+
+      def source
+        (defined?(@source) && @source) || super
+      end
     end
 
+    prepend AllowSettingSource
+
     alias_method :rg_full_gem_path, :full_gem_path
     alias_method :rg_loaded_from,   :loaded_from