lib/rubocop/cop/mixin/negative_conditional.rb in rubocop-0.40.0 vs lib/rubocop/cop/mixin/negative_conditional.rb in rubocop-0.41.0

@@ -4,20 +4,22 @@
 module RuboCop
   module Cop
     # Some common code shared between FavorUnlessOverNegatedIf and
     # FavorUntilOverNegatedWhile.
     module NegativeConditional
+      def self.included(mod)
+        mod.def_node_matcher :single_negative?, '(send !(send _ :!) :!)'
+      end
+
       def check_negative_conditional(node)
         condition, _body, _rest = *node
 
         # Look at last expression of contents if there are parentheses
         # around condition.
         condition = condition.children.last while condition.type == :begin
-        return unless condition.type == :send
 
-        _object, method = *condition
-        return unless method == :! && !(node.loc.respond_to?(:else) &&
-                                        node.loc.else)
+        return unless single_negative?(condition) &&
+                      !(node.loc.respond_to?(:else) && node.loc.else)
 
         add_offense(node, :expression)
       end
     end
   end