* math.c (to_flo): rb_Float() accepts even strings for input.

* complex.c (nucomp_to_f): fix wrong message.

* complex.c (nucomp_to_r): ditto.

* object.c (rb_Float): do not check NaN for error.  NaN is a part
  of valid float values.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@16429 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_float.rb

@@ -415,7 +415,7 @@ class TestFloat < Test::Unit::TestCase
     assert_raise(TypeError) { Float(nil) }
     o = Object.new
     def o.to_f; inf = 1.0/0.0; inf/inf; end
-    assert_raise(ArgumentError) { Float(o) }
+    assert(Float(o).nan?)
   end
 
   def test_num2dbl