Add `#installed_caskfile` method to `Cask` class.

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

@@ -84,6 +84,11 @@ module Hbc
       !versions.empty?
     end
 
+    def installed_caskfile
+      installed_version = timestamped_versions.last
+      metadata_master_container_path.join(*installed_version, "Casks", "#{token}.rb")
+    end
+
     def to_s
       @token
     end

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

@@ -36,8 +36,7 @@ module Hbc
               elsif @options[:versions]
                 puts format_versioned(cask)
               else
-                installed_caskfile = cask.metadata_master_container_path.join(*cask.timestamped_versions.last, "Casks", "#{cask_token}.rb")
-                cask = Hbc.load(installed_caskfile)
+                cask = CaskLoader.load_from_file(cask.installed_caskfile)
                 list_artifacts(cask)
               end
 

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

@@ -17,16 +17,10 @@ module Hbc
             if cask.installed?
               # use copy of cask for uninstallation to avoid 'No such file or directory' bug
               installed_cask = cask
-              latest_installed_version = installed_cask.timestamped_versions.last
 
-              unless latest_installed_version.nil?
-                latest_installed_cask_file = installed_cask.metadata_master_container_path
-                                                           .join(latest_installed_version
-                                                           .join(File::Separator),
-                                                           "Casks", "#{cask_token}.rb")
-
-                # use the same cask file that was used for installation, if possible
-                installed_cask = CaskLoader.load_from_file(latest_installed_cask_file) if latest_installed_cask_file.exist?
+              # use the same cask file that was used for installation, if possible
+              if (installed_caskfile = installed_cask.installed_caskfile).exist?
+                installed_cask = CaskLoader.load_from_file(installed_caskfile)
               end
 
               # Always force uninstallation, ignore method parameter