Fix constant lookup in contexts

Author: extern-c

lib/rdoc/code_object/context.rb

@@ -779,9 +779,8 @@ def find_class_method_named(name)
   # Finds a constant with +name+ in this context
 
   def find_constant_named(name)
-    @constants.find do |m|
-      m.name == name || m.full_name == name
-    end
+    name = name[2..-1] if name.start_with?('::')
+    @constants.find { |m| m.name == name || m.full_name == name }
   end
 
   ##

test/rdoc/rdoc_context_test.rb

@@ -524,6 +524,7 @@ def test_find_class_method_named
   def test_find_constant_named
     assert_nil             @c1.find_constant_named('NONE')
     assert_equal ':const', @c1.find_constant_named('CONST').value
+    assert_equal ':const', @c1.find_constant_named('::CONST').value
   end
 
   def test_find_enclosing_module_named