From 3994d5937dba3e3acee816cba94f3fe208cac210 Mon Sep 17 00:00:00 2001
From: Mike McQuaid <mike@mikemcquaid.com>
Date: Sun, 8 Apr 2018 16:02:02 -0700
Subject: [PATCH] keg: don't remove versioned aliases on unlink.

Fixes #4030.
---
 Library/Homebrew/keg.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Library/Homebrew/keg.rb b/Library/Homebrew/keg.rb
index cf8d1b177e..7e930cc375 100644
--- a/Library/Homebrew/keg.rb
+++ b/Library/Homebrew/keg.rb
@@ -243,6 +243,8 @@ class Keg
     end
 
     aliases.each do |a|
+      # versioned aliases are handled below
+      next if a =~ /.+@./
       alias_symlink = opt/a
       if alias_symlink.symlink? && alias_symlink.exist?
         alias_symlink.delete if alias_symlink.realpath == opt_record.realpath
@@ -252,7 +254,7 @@ class Keg
     end
 
     Pathname.glob("#{opt_record}@*").each do |a|
-      a = a.basename
+      a = a.basename.to_s
       next if aliases.include?(a)
 
       alias_symlink = opt/a