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@@ -281,9 +281,7 @@ module ActiveSupport
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       names.shift if names.empty? || names.first.empty?
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       constant = Object
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-      names.each do |name|
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-        constant = constant.const_defined?(name) ? constant.const_get(name) : constant.const_missing(name)
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-      end
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+      names.each { |name| constant = constant.const_get(name) }
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       constant
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     end
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@@ -2,8 +2,21 @@ require 'abstract_unit'
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 require 'inflector_test_cases'
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 module Ace
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+  module Extension
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+    def self.included(base)
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+      base.extend(ClassMethods)
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+    end
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+
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+    module ClassMethods
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+      def mission_accomplished?
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+        false
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+      end
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+    end
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+  end
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+
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   module Base
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     class Case
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+      include Extension
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     end
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   end
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 end
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@@ -121,7 +134,9 @@ class InflectorTest < Test::Unit::TestCase
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   end
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   def test_constantize_does_lexical_lookup
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-    assert_raises(NameError) { ActiveSupport::Inflector.constantize("Ace::Base::InflectorTest") }
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+    assert_equal InflectorTest, ActiveSupport::Inflector.constantize("Ace::Base::InflectorTest")
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+    assert_nothing_raised { Ace::Base::Case::ClassMethods }
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+    assert_nothing_raised { assert_equal Ace::Base::Case::ClassMethods, ActiveSupport::Inflector.constantize("Ace::Base::Case::ClassMethods") }
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   end
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   def test_ordinal