From d2f7a2c410c3b6912f9f905e8e33080cd7e7bbf5 Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Sun, 17 May 2015 21:31:43 +0800
Subject: [PATCH] ARGV#kegs: try to load fomrula from rack

---
 Library/Homebrew/extend/ARGV.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Library/Homebrew/extend/ARGV.rb b/Library/Homebrew/extend/ARGV.rb
index 77def5af6f..89ac6abf1b 100644
--- a/Library/Homebrew/extend/ARGV.rb
+++ b/Library/Homebrew/extend/ARGV.rb
@@ -51,7 +51,7 @@ module HomebrewArgvExtension
           Keg.new(linked_keg_ref.resolved_path)
         elsif dirs.length == 1
           Keg.new(dirs.first)
-        elsif (prefix = Formulary.factory(canonical_name).prefix).directory?
+        elsif (prefix = (name.include?("/") ? Formulary.factory(name) : Formulary.from_rack(rack)).prefix).directory?
           Keg.new(prefix)
         else
           raise MultipleVersionsInstalledError.new(canonical_name)