diff --git a/language/predefined_spec.rb b/language/predefined_spec.rb
index a78ef9c76..e8d7f739b 100644
--- a/language/predefined_spec.rb
+++ b/language/predefined_spec.rb
@@ -720,6 +720,15 @@ def foo
       $/ = str
       $/.should.equal?(str)
     end
+
+    it "assigns the default separator if the given String is equal to it" do
+      default = "\n"
+      str = "\n".dup.freeze
+      $/ = str
+      $/.should_not.equal?(str)
+      $/.should.frozen?
+      $/.should == default
+    end
   end
 
   it "can be assigned nil" do
@@ -801,6 +810,15 @@ def foo
       $-0 = str
       $-0.should.equal?(str)
     end
+
+    it "assigns the default separator if the given String is equal to it" do
+      default = "\n"
+      str = "\n".dup.freeze
+      $-0 = str
+      $-0.should_not.equal?(str)
+      $-0.should.frozen?
+      $-0.should == default
+    end
   end
 
   it "can be assigned nil" do