From 447818ea3b2efabd172a4512444cc1a416a93265 Mon Sep 17 00:00:00 2001
From: yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sun, 12 Apr 2009 14:02:19 +0000
Subject: merges r22741 from trunk into ruby_1_9_1. --

* lib/prime.rb (Prime::prime?): used to return a wrong answer.
  [ruby-core:22646].

* test/test_prime.rb (test_prime?): test case for [ruby-core:22646].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@23176 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/prime.rb | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib')

diff --git a/lib/prime.rb b/lib/prime.rb
index 650d279bc4..ce71d5e00f 100644
--- a/lib/prime.rb
+++ b/lib/prime.rb
@@ -144,6 +144,8 @@ class Prime
   # +value+:: an arbitrary integer to be checked.
   # +generator+:: optional. A pseudo-prime generator.
   def prime?(value, generator = Prime::Generator23.new)
+    value = -value if value < 0
+    return false if value < 2
     for num in generator
       q,r = value.divmod num
       return true if q < num
-- 
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