Follow up to #2278

Changelog.md

@@ -1,6 +1,11 @@
 ### Development
 [Full Changelog](http://github.com/rspec/rspec-core/compare/v3.5.1...master)
 
+Enhancements:
+
+* Warn when duplicate shared exmaples definitions are loaded due to being
+  defined in files matching the spec pattern (e.g. `_spec.rb`) (#2278, Devon Estes)
+
 ### 3.5.1 / 2016-07-06
 [Full Changelog](http://github.com/rspec/rspec-core/compare/v3.5.0...v3.5.1)
 

lib/rspec/core/shared_example_group.rb

@@ -240,8 +240,16 @@ def warn_if_key_taken(context, key, new_block)
           end
         end
 
-        def formatted_location(block)
-          block.source_location.join(":").gsub(/:in.*$/, '')
+        if RUBY_VERSION.to_f >= 1.9
+          def formatted_location(block)
+            block.source_location.join(":")
+          end
+        else # 1.8.7
+          # :nocov:
+          def formatted_location(block)
+            block.source_location.join(":").gsub(/:in.*$/, '')
+          end
+          # :nocov:
         end
 
         if Proc.method_defined?(:source_location)