Revert "parse.y: Deprecate flip-flops"

This reverts commit bae638ad5b782c44c80efe33834cb9039279af46.

[Feature #5400]

1 files changed, 0 insertions, 12 deletions

diff --git a/spec/ruby/language/if_spec.rb b/spec/ruby/language/if_spec.rb
index 4d809019c9..e2201f4626 100644
--- a/spec/ruby/language/if_spec.rb
+++ b/spec/ruby/language/if_spec.rb
@@ -308,18 +308,6 @@ describe "The if expression" do
       6.times(&b)
       ScratchPad.recorded.should == [4, 5, 4, 5]
     end
-
-    ruby_version_is "2.6" do
-      it 'is deprecated' do
-        i = 4
-
-        -> do
-          eval "ScratchPad << 'it works' if (i == 4)..(i == 7)"
-        end.should complain(/flip-flop is deprecated/)
-
-        ScratchPad.recorded.should == ['it works']
-      end
-    end
   end
 end