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+@node toupper
+@section @code{toupper}
+@findex toupper
+
+POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/toupper.html}
+
+Gnulib module: ---
+
+Portability problems fixed by Gnulib:
+@itemize
+@end itemize
+
+Portability problems not fixed by Gnulib:
+@itemize
+@item
+On AIX and Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot
+accommodate all Unicode characters.
+@end itemize