yugui	2008-12-25 18:53:31 +0900 (Thu, 25 Dec 2008)

  New Revision: 21012

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=21012

  Log:
    merges r20938 from trunk into ruby_1_9_1.
    * lib/mathn.rb: Math.sqrt(NaN) should be NaN. [ruby-dev:37537]

  Modified files:
    branches/ruby_1_9_1/ChangeLog
    branches/ruby_1_9_1/lib/mathn.rb

Index: ruby_1_9_1/ChangeLog
===================================================================
--- ruby_1_9_1/ChangeLog	(revision 21011)
+++ ruby_1_9_1/ChangeLog	(revision 21012)
@@ -1,3 +1,7 @@
+Tue Dec 23 15:46:43 2008  Yuki Sonoda (Yugui)  <yugui@y...>
+
+	* lib/mathn.rb: Math.sqrt(NaN) should be NaN. [ruby-dev:37537]
+
 Tue Dec 23 15:46:47 2008  Eric Hodel  <drbrain@s...>
 	* gem_prelude.rb:  Match full RubyGems behavior when a gem can't be
 	  found.
Index: ruby_1_9_1/lib/mathn.rb
===================================================================
--- ruby_1_9_1/lib/mathn.rb	(revision 21011)
+++ ruby_1_9_1/lib/mathn.rb	(revision 21012)
@@ -134,6 +134,8 @@
       else
 	Complex(x, -y)
       end
+    elsif a.respond_to?(:nan?) and a.nan?
+      a
     elsif a >= 0
       rsqrt(a)
     else

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