[rubygems/rubygems] Unconditionally set installed_by_version

It has been supported since RubyGems 2.2.0 via https://github.com/rubygems/rubygems/commit/4525e45a4d45

Signed-off-by: Samuel Giddins <segiddins@segiddins.me>

https://github.com/rubygems/rubygems/commit/bf39c583e8

lib/bundler/plugin/api/source.rb

@@ -131,7 +131,7 @@ module Bundler
           Bundler::Index.build do |index|
             files.each do |file|
               next unless spec = Bundler.load_gemspec(file)
-              Bundler.rubygems.set_installed_by_version(spec)
+              spec.installed_by_version = Gem::VERSION
 
               spec.source = self
               Bundler.rubygems.validate(spec)

lib/bundler/rubygems_integration.rb

@@ -61,11 +61,6 @@ module Bundler
       nil
     end
 
-    def set_installed_by_version(spec, installed_by_version = Gem::VERSION)
-      return unless spec.respond_to?(:installed_by_version=)
-      spec.installed_by_version = Gem::Version.create(installed_by_version)
-    end
-
     def spec_missing_extensions?(spec, default = true)
       return spec.missing_extensions? if spec.respond_to?(:missing_extensions?)
 

lib/bundler/source/git.rb

@@ -299,7 +299,7 @@ module Bundler
           # The gemspecs we cache should already be evaluated.
           spec = Bundler.load_gemspec(spec_path)
           next unless spec
-          Bundler.rubygems.set_installed_by_version(spec)
+          spec.installed_by_version = Gem::VERSION
           Bundler.rubygems.validate(spec)
           File.open(spec_path, "wb") {|file| file.write(spec.to_ruby) }
         end

lib/bundler/source/path.rb

@@ -148,7 +148,7 @@ module Bundler
 
       def load_gemspec(file)
         return unless spec = Bundler.load_gemspec(file)
-        Bundler.rubygems.set_installed_by_version(spec)
+        spec.installed_by_version = Gem::VERSION
         spec
       end
 

lib/rubygems/specification.rb

@@ -2472,7 +2472,7 @@ class Gem::Specification < Gem::BasicSpecification
 
     if @installed_by_version
       result << nil
-      result << "  s.installed_by_version = #{ruby_code Gem::VERSION} if s.respond_to? :installed_by_version"
+      result << "  s.installed_by_version = #{ruby_code Gem::VERSION}"
     end
 
     unless dependencies.empty?

test/rubygems/test_gem_specification.rb

@@ -2368,7 +2368,7 @@ Gem::Specification.new do |s|
   s.rubygems_version = "#{Gem::VERSION}".freeze
   s.summary = "this is a summary".freeze
 
-  s.installed_by_version = "#{Gem::VERSION}".freeze if s.respond_to? :installed_by_version
+  s.installed_by_version = "#{Gem::VERSION}".freeze
 
   s.specification_version = #{Gem::Specification::CURRENT_SPECIFICATION_VERSION}