From 6563043c754642c46ffbf984fbbba5183763e0bc Mon Sep 17 00:00:00 2001
From: ilovezfs <ilovezfs@icloud.com>
Date: Tue, 12 Jun 2018 18:00:56 -0700
Subject: [PATCH] bump-formula-pr: don't unset --mirror= value

---
 Library/Homebrew/dev-cmd/bump-formula-pr.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/dev-cmd/bump-formula-pr.rb b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
index 6dad0f3ad2..1fd41737e3 100644
--- a/Library/Homebrew/dev-cmd/bump-formula-pr.rb
+++ b/Library/Homebrew/dev-cmd/bump-formula-pr.rb
@@ -149,7 +149,7 @@ module Homebrew
     elsif !new_url
       odie "#{formula}: no --url= argument specified!"
     else
-      new_mirror = case new_url
+      new_mirror ||= case new_url
       when requested_spec != :devel && %r{.*ftp.gnu.org/gnu.*}
         new_url.sub "ftp.gnu.org/gnu", "ftpmirror.gnu.org"
       when %r{.*mirrors.ocf.berkeley.edu/debian.*}
-- 
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