usa	2010-04-20 22:53:08 +0900 (Tue, 20 Apr 2010)

  New Revision: 27420

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=27420

  Log:
    * io.c: fixed the wrong description of rdoc.

  Modified files:
    trunk/io.c

Index: io.c
===================================================================
--- io.c	(revision 27419)
+++ io.c	(revision 27420)
@@ -6318,9 +6318,13 @@
  *  <code>intern</code> is the internal encoding.
  *  <code>fmode</code> must be combination of the directives. See
  *  the description of class +IO+ for a description of the directives.
- *  Changing reading/writing mode from the original io object is not
- *  supported on some platforms, e.g. Windows.
  *
+ *  When the mode of original IO is read only, the mode cannot be changed to
+ *  be writable.  Similarly, the mode cannot be changed from write only to
+ *  readable.
+ *  If such a wrong change is directed, timing where the error actually occurs
+ *  is different according to the platform.
+ *
  *  ==== Options
  *  <code>opt</code> can have the following keys
  *  :mode ::

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