Spec that rescue *list converts using #to_a

* See #2572

spec/ruby/language/rescue_spec.rb

@@ -115,6 +115,18 @@ class ArbitraryException < StandardError
     end
   end
 
+  it "converts the splatted list of exceptions using #to_a" do
+    exceptions = mock("to_a")
+    exceptions.should_receive(:to_a).and_return(exception_list)
+    caught_it = false
+    begin
+      raise SpecificExampleException, "not important"
+    rescue *exceptions
+      caught_it = true
+    end
+    caught_it.should be_true
+  end
+
   it "can combine a splatted list of exceptions with a literal list of exceptions" do
     caught_it = false
     begin