From ec4011a46e34bb0fd8ff274b5b537457e02e0037 Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Sat, 16 May 2015 12:12:55 +0800
Subject: [PATCH] Formula#installed: loading using Formulary.from_rack

Also handle TapFormulaAmbiguityError
---
 Library/Homebrew/formula.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 60c9fa65ac..7e62349222 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -649,8 +649,8 @@ class Formula
 
     HOMEBREW_CELLAR.subdirs.map do |rack|
       begin
-        Formulary.factory(rack.basename.to_s)
-      rescue FormulaUnavailableError
+        Formulary.from_rack(rack)
+      rescue FormulaUnavailableError, TapFormulaAmbiguityError
       end
     end.compact
   end