From b78308d2d5a8dd26818eba88bb58ee547d6dfdb0 Mon Sep 17 00:00:00 2001
From: Jack Nagel <jacknagel@gmail.com>
Date: Thu, 3 Jul 2014 14:54:14 -0500
Subject: [PATCH] Fix Formula#<=> on trunk Ruby

Arguably this method shouldn't exist and sort_by(&:name) used instead.
---
 Library/Homebrew/formula.rb           | 7 +++++--
 Library/Homebrew/test/test_formula.rb | 4 ++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 64f329a7ee..09dee3cbe7 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -301,9 +301,12 @@ class Formula
   def hash
     name.hash
   end
-  def <=> b
-    name <=> b.name
+
+  def <=>(other)
+    return unless Formula === other
+    name <=> other.name
   end
+
   def to_s
     name
   end
diff --git a/Library/Homebrew/test/test_formula.rb b/Library/Homebrew/test/test_formula.rb
index 900d7272cd..9a509f3bfd 100644
--- a/Library/Homebrew/test/test_formula.rb
+++ b/Library/Homebrew/test/test_formula.rb
@@ -139,6 +139,10 @@ class FormulaTests < Homebrew::TestCase
     refute_equal TestBall.new, Object.new
   end
 
+  def test_sort_operator
+    assert_nil TestBall.new <=> Object.new
+  end
+
   def test_class_naming
     assert_equal 'ShellFm', Formulary.class_s('shell.fm')
     assert_equal 'Fooxx', Formulary.class_s('foo++')