From 48dcf1916928999776df36882a553f15a9f0ffe7 Mon Sep 17 00:00:00 2001
From: Markus Reiter <me@reitermark.us>
Date: Sun, 19 Aug 2018 22:10:20 +0200
Subject: [PATCH] Ignore unparsable system languages.

---
 Library/Homebrew/cask/lib/hbc/dsl.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/cask/lib/hbc/dsl.rb b/Library/Homebrew/cask/lib/hbc/dsl.rb
index 07d0c6ae1b..65c41d4614 100644
--- a/Library/Homebrew/cask/lib/hbc/dsl.rb
+++ b/Library/Homebrew/cask/lib/hbc/dsl.rb
@@ -138,7 +138,17 @@ module Hbc
         raise CaskInvalidError.new(cask, "No default language specified.")
       end
 
-      MacOS.languages.map(&Locale.method(:parse)).each do |locale|
+      locales = MacOS.languages
+                     .map do |language|
+                       begin
+                         Locale.parse(language)
+                       rescue Locale::ParserError
+                         nil
+                       end
+                     end
+                     .compact
+
+      locales.each do |locale|
         key = locale.detect(@language_blocks.keys)
 
         next if key.nil?