Fix details in cask command

Library/Homebrew/cask/lib/hbc/artifact/abstract_flight_block.rb

@@ -26,10 +26,6 @@ module Hbc
         abstract_phase(self.class.uninstall_dsl_key)
       end
 
-      def summarize
-        directives.keys.map(&:to_s).join(", ")
-      end
-
       private
 
       def class_for_dsl_key(dsl_key)
@@ -41,6 +37,10 @@ module Hbc
         return if (block = directives[dsl_key]).nil?
         class_for_dsl_key(dsl_key).new(cask).instance_eval(&block)
       end
+
+      def summarize
+        directives.keys.map(&:to_s).join(", ")
+      end
     end
   end
 end

Library/Homebrew/cask/lib/hbc/cask.rb

@@ -139,10 +139,10 @@ module Hbc
         "version" => version,
         "sha256" => sha256,
         "artifacts" => artifacts.map do |a|
-          if a.respond_to? :to_a
+          if a.respond_to? :to_h
-            a.to_a
-          elsif a.methods.include? :to_h
             a.to_h
+          elsif a.respond_to? :to_a
+            a.to_a
           else
             a
           end