lib/mutant/matcher/null.rb in mutant-0.8.16 vs lib/mutant/matcher/null.rb in mutant-0.8.17

@@ -1,4 +1,6 @@
+# frozen_string_literal: true
+
 module Mutant
   class Matcher
     # A null matcher, that does not match any subjects
     class Null < self
       include Concord.new