lib/mutant/subject.rb in mutant-0.6.3 vs lib/mutant/subject.rb in mutant-0.6.4

@@ -112,13 +112,10 @@
     #
     # @return [Enumerable<Expression>]
     #
     # @api private
     #
-    def match_expressions
-      [expression].concat(context.match_expressions)
-    end
-    memoize :match_expressions
+    abstract_method :match_expressions
 
   private
 
     # Return neutral mutation
     #