1 files changed, 21 insertions, 12 deletions
diff --git a/activesupport/lib/active_support/core_ext/module/introspection.rb b/activesupport/lib/active_support/core_ext/module/introspection.rb
index 7e4d8e44fc..ddc9297b95 100644
--- a/activesupport/lib/active_support/core_ext/module/introspection.rb
+++ b/activesupport/lib/active_support/core_ext/module/introspection.rb
@@ -5,7 +5,7 @@ class Module
     parent_name = name.split('::')[0..-2] * '::'
     parent_name.empty? ? Object : parent_name.constantize
   end
-  
+
   # Return all the parents of this module, ordered from nested outwards. The
   # receiver is not contained within the result.
   def parents
@@ -18,18 +18,27 @@ class Module
     parents << Object unless parents.include? Object
     parents
   end
-  
-  # Return the constants that have been defined locally by this object and not
-  # in an ancestor. This method may miss some constants if their definition in
-  # the ancestor is identical to their definition in the receiver.
-  def local_constants
-    inherited = {}
-    ancestors.each do |anc|
-      next if anc == self
-      anc.constants.each { |const| inherited[const] = anc.const_get(const) }
+
+  if RUBY_VERSION < '1.9'
+    # Return the constants that have been defined locally by this object and
+    # not in an ancestor. This method is exact if running under Ruby 1.9. In
+    # previous versions it may miss some constants if their definition in some
+    # ancestor is identical to their definition in the receiver.
+    def local_constants
+      inherited = {}
+
+      ancestors.each do |anc|
+        next if anc == self
+        anc.constants.each { |const| inherited[const] = anc.const_get(const) }
+      end
+
+      constants.select do |const|
+        !inherited.key?(const) || inherited[const].object_id != const_get(const).object_id
+      end
     end
-    constants.select do |const|
-      ! inherited.key?(const) || inherited[const].object_id != const_get(const).object_id
+  else
+    def local_constants #:nodoc:
+      constants(false)
     end
   end