1 files changed, 20 insertions, 0 deletions
diff --git a/lib/rubygems/resolver/composed_set.rb b/lib/rubygems/resolver/composed_set.rb
new file mode 100644
index 0000000000..e4aa15e4d0
--- /dev/null
+++ b/lib/rubygems/resolver/composed_set.rb
@@ -0,0 +1,20 @@
+class Gem::Resolver::ComposedSet < Gem::Resolver::Set
+
+  attr_reader :sets # :nodoc:
+
+  def initialize *sets
+    @sets = sets
+  end
+
+  def find_all req
+    res = []
+    @sets.each { |s| res += s.find_all(req) }
+    res
+  end
+
+  def prefetch reqs
+    @sets.each { |s| s.prefetch(reqs) }
+  end
+
+end
+