Add missing summarize method.

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

@@ -37,7 +37,7 @@ module Hbc
       end
 
       def summarize
-        to_h.map { |key, val| [*val].map { |v| "#{key.inspect} => #{v.inspect}" }.join(", ") }.join(", ")
+        to_h.flat_map { |key, val| [*val].map { |v| "#{key.inspect} => #{v.inspect}" } }.join(", ")
       end
 
       private

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

@@ -16,6 +16,10 @@ module Hbc
 
       private
 
+      def summarize
+        path.relative_path_from(cask.staged_path).to_s
+      end
+
       def extract(command: nil, verbose: nil, **_)
         container = Container.for_path(path, command)