[rubygems/rubygems] Improve resolver error messages

Use a more standard naming for gems.

https://github.com/rubygems/rubygems/commit/75121e83f1

lib/bundler/resolver.rb

@@ -264,30 +264,18 @@ module Bundler
         else
           source = source_for(name)
           specs = source.specs.search(name)
-          versions_with_platforms = specs.map {|s| [s.version, s.platform] }
           cache_message = begin
                               " or in gems cached in #{Bundler.settings.app_cache_path}" if Bundler.app_cache.exist?
                             rescue GemfileNotFound
                               nil
                             end
           message = String.new("Could not find gem '#{SharedHelpers.pretty_dependency(requirement)}' in #{source}#{cache_message}.\n")
-          message << "The source contains the following versions of '#{name}': #{formatted_versions_with_platforms(versions_with_platforms)}" if versions_with_platforms.any?
+          message << "The source contains the following gems matching '#{name}': #{specs.map(&:full_name).join(", ")}" if specs.any?
         end
         raise GemNotFound, message
       end
     end
 
-    def formatted_versions_with_platforms(versions_with_platforms)
-      version_platform_strs = versions_with_platforms.map do |vwp|
-        version = vwp.first
-        platform = vwp.last
-        version_platform_str = String.new(version.to_s)
-        version_platform_str << " #{platform}" unless platform.nil? || platform == Gem::Platform::RUBY
-        version_platform_str
-      end
-      version_platform_strs.join(", ")
-    end
-
     def version_conflict_message(e)
       # only show essential conflicts, if possible
       conflicts = e.conflicts.dup

spec/bundler/commands/exec_spec.rb

@@ -867,7 +867,7 @@ RSpec.describe "bundle exec" do
       let(:expected) { "" }
       let(:expected_err) { <<-EOS.strip }
 Could not find gem 'rack (= 2)' in locally installed gems.
-The source contains the following versions of 'rack': 0.9.1, 1.0.0
+The source contains the following gems matching 'rack': rack-0.9.1, rack-1.0.0
 Run `bundle install` to install missing gems.
       EOS
 
@@ -894,7 +894,7 @@ Run `bundle install` to install missing gems.
       let(:expected) { "" }
       let(:expected_err) { <<-EOS.strip }
 Could not find gem 'rack (= 2)' in locally installed gems.
-The source contains the following versions of 'rack': 1.0.0
+The source contains the following gems matching 'rack': rack-1.0.0
 Run `bundle install` to install missing gems.
       EOS
 

spec/bundler/install/gemfile/git_spec.rb

@@ -89,7 +89,7 @@ RSpec.describe "bundle install with git sources" do
         gem "foo", "1.1", :git => "#{lib_path("foo-1.0")}"
       G
 
-      expect(err).to include("The source contains the following versions of 'foo': 1.0")
+      expect(err).to include("The source contains the following gems matching 'foo': foo-1.0")
     end
 
     it "complains with version and platform if pinned specs don't exist in the git repo" do
@@ -106,7 +106,7 @@ RSpec.describe "bundle install with git sources" do
         end
       G
 
-      expect(err).to include("The source contains the following versions of 'only_java': 1.0 java")
+      expect(err).to include("The source contains the following gems matching 'only_java': only_java-1.0-java")
     end
 
     it "complains with multiple versions and platforms if pinned specs don't exist in the git repo" do
@@ -128,7 +128,7 @@ RSpec.describe "bundle install with git sources" do
         end
       G
 
-      expect(err).to include("The source contains the following versions of 'only_java': 1.0 java, 1.1 java")
+      expect(err).to include("The source contains the following gems matching 'only_java': only_java-1.0-java, only_java-1.1-java")
     end
 
     it "still works after moving the application directory" do