yugui	2008-12-23 15:48:42 +0900 (Tue, 23 Dec 2008)

  New Revision: 20938

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=20938

  Log:
    * lib/mathn.rb: Math.sqrt(NaN) should be NaN. [ruby-dev:37537]

  Modified files:
    trunk/ChangeLog
    trunk/lib/mathn.rb

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 20937)
+++ ChangeLog	(revision 20938)
@@ -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: lib/mathn.rb
===================================================================
--- lib/mathn.rb	(revision 20937)
+++ lib/mathn.rb	(revision 20938)
@@ -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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