1 files changed, 5 insertions, 1 deletions
diff --git a/lib/range_ext.rb b/lib/range_ext.rb
index a6a3bfc5d..e7e0e903f 100644
--- a/lib/range_ext.rb
+++ b/lib/range_ext.rb
@@ -1,11 +1,15 @@
 class Range
 
   def intersection(other)
-    return nil if (self.max < other.min or other.max < self.min)
+    return nil unless intersect?(other)
     [self.min, other.min].max..[self.max, other.max].min
   end
   alias_method :&, :intersection
 
+  def intersect?(other)
+    self.max > other.min and other.max > self.min
+  end
+
   def remove(other)
     return self if (self.max < other.min or other.max < self.min)