mrkn	2012-11-08 09:34:55 +0900 (Thu, 08 Nov 2012)

  New Revision: 37546

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=37546

  Log:
    * numeric.c: Add description of that the results of the comparing
      operations of two NaNs are undefined.
      [#1720] [ruby-dev:38725] [ruby-core:36966]

  Modified files:
    trunk/ChangeLog
    trunk/numeric.c

Index: ChangeLog
===================================================================
--- ChangeLog	(revision 37545)
+++ ChangeLog	(revision 37546)
@@ -1,3 +1,9 @@
+Thu Nov  8 09:34:00 2012  Kenta Murata  <mrkn@c...>
+
+	* numeric.c: Add description of that the results of the comparing
+	  operations of two NaNs are undefined.
+	  [#1720] [ruby-dev:38725] [ruby-core:36966]
+
 Thu Nov  8 04:45:21 2012  Marc-Andre Lafortune  <ruby-core@m...>
 
 	* include/ruby/intern.h: Restore rb_enumeratorize as it was before
Index: numeric.c
===================================================================
--- numeric.c	(revision 37545)
+++ numeric.c	(revision 37546)
@@ -1042,6 +1042,8 @@
  *  Returns <code>true</code> only if <i>obj</i> has the same value
  *  as <i>flt</i>. Contrast this with <code>Float#eql?</code>, which
  *  requires <i>obj</i> to be a <code>Float</code>.
+ *  The result of <code>NaN == NaN</code> is undefined, so the
+ *  implementation-dependent value is returned.
  *
  *     1.0 == 1   #=> true
  *
@@ -1109,6 +1111,8 @@
  *  Returns -1, 0, +1 or nil depending on whether <i>flt</i> is less
  *  than, equal to, or greater than <i>real</i>. This is the basis for
  *  the tests in <code>Comparable</code>.
+ *  The result of <code>NaN <=> NaN</code> is undefined, so the
+ *  implementation-dependent value is returned.
  */
 
 static VALUE
@@ -1153,6 +1157,8 @@
  *   flt > real  ->  true or false
  *
  * <code>true</code> if <code>flt</code> is greater than <code>real</code>.
+ * The result of <code>NaN > NaN</code> is undefined, so the
+ * implementation-dependent value is returned.
  */
 
 static VALUE
@@ -1193,6 +1199,8 @@
  *
  * <code>true</code> if <code>flt</code> is greater than
  * or equal to <code>real</code>.
+ * The result of <code>NaN >= NaN</code> is undefined, so the
+ * implementation-dependent value is returned.
  */
 
 static VALUE
@@ -1232,6 +1240,8 @@
  *   flt < real  ->  true or false
  *
  * <code>true</code> if <code>flt</code> is less than <code>real</code>.
+ * The result of <code>NaN < NaN</code> is undefined, so the
+ * implementation-dependent value is returned.
  */
 
 static VALUE
@@ -1272,6 +1282,8 @@
  *
  * <code>true</code> if <code>flt</code> is less than
  * or equal to <code>real</code>.
+ * The result of <code>NaN <= NaN</code> is undefined, so the
+ * implementation-dependent value is returned.
  */
 
 static VALUE
@@ -1313,6 +1325,8 @@
  *  Returns <code>true</code> only if <i>obj</i> is a
  *  <code>Float</code> with the same value as <i>flt</i>. Contrast this
  *  with <code>Float#==</code>, which performs type conversions.
+ *  The result of <code>NaN.eql?(NaN)</code> is undefined, so the
+ *  implementation-dependent value is returned.
  *
  *     1.0.eql?(1)   #=> false
  */

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