Don't warn on system gems.

2 files changed, 18 insertions, 0 deletions

diff --git a/lib/bundler/source/rubygems.rb b/lib/bundler/source/rubygems.rb
index 178c186eef..d31acdb980 100644
--- a/lib/bundler/source/rubygems.rb
+++ b/lib/bundler/source/rubygems.rb
@@ -79,6 +79,7 @@ module Bundler
           # Check for this spec from other sources
           uris = [spec.source_uri]
           uris += source_uris_for_spec(spec)
+          uris.compact!
           uris.uniq!
           Installer.ambiguous_gems << [spec.name, *uris] if uris.length > 1
 
diff --git a/spec/install/gems/sources_spec.rb b/spec/install/gems/sources_spec.rb
index 20566f4cae..cd4bcf1992 100644
--- a/spec/install/gems/sources_spec.rb
+++ b/spec/install/gems/sources_spec.rb
@@ -209,4 +209,21 @@ describe "bundle install with gems on multiple sources" do
       end
     end
   end
+
+  context "when an older version of the same gem also ships with Ruby" do
+    before do
+      system_gems "rack-0.9.1"
+
+      gemfile <<-G
+        source "file://#{gem_repo1}"
+        gem "rack" # shoud come from repo1!
+      G
+    end
+
+    it "installs the gems without any warning" do
+      bundle :install
+      expect(out).not_to include("Warning")
+      should_be_installed("rack 1.0.0")
+    end
+  end
 end