From fade4af0502743410c98fa5de59a1657e1f3c4a8 Mon Sep 17 00:00:00 2001
From: Xu Cheng <xucheng@me.com>
Date: Sun, 29 Nov 2015 15:38:40 +0800
Subject: [PATCH] formula_pin: use installed_prefixes/installed_kegs

---
 Library/Homebrew/formula_pin.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/formula_pin.rb b/Library/Homebrew/formula_pin.rb
index 7ecad9d7b2..c9a195fdd9 100644
--- a/Library/Homebrew/formula_pin.rb
+++ b/Library/Homebrew/formula_pin.rb
@@ -18,7 +18,7 @@ class FormulaPin
   end
 
   def pin
-    pin_at(@f.rack.subdirs.map { |d| Keg.new(d).version }.max)
+    pin_at(@f.installed_kegs.map { |keg| keg.version }.max)
   end
 
   def unpin
@@ -31,7 +31,7 @@ class FormulaPin
   end
 
   def pinnable?
-    @f.rack.exist? && @f.rack.subdirs.length > 0
+    @f.installed_prefixes.any?
   end
 
   def pinned_version