do not pass -infinity.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@20647 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,7 +1,6 @@
 Thu Dec 11 23:48:00 2008  Tadayoshi Funaba  <tadf@dotrb.org>
 
-	* lib/cmath.rb (sqrt): should pass nan or infinity to the original
-	  method.
+	* lib/cmath.rb (sqrt): should pass nan to the original method.
 
 Thu Dec 11 21:04:04 2008  Kouhei Sutou  <kou@cozmixng.org>
 

lib/cmath.rb

@@ -57,10 +57,10 @@ module CMath
 
   def sqrt(z)
     if z.real?
-      if z >= 0 || (Float === z && (z.nan? || z.infinite?))
-	sqrt!(z)
-      else
+      if z < 0
 	Complex(0, sqrt!(-z))
+      else
+	sqrt!(z)
       end
     else
       if z.imag < 0