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@node iswalnum
@section @code{iswalnum}
@findex iswalnum
POSIX specification: @url{http://www.opengroup.org/susv3xsh/iswalnum.html}
Gnulib module: wctype
Portability problems fixed by Gnulib:
@itemize
@item
This function is missing on some platforms:
IRIX 5.3, Solaris 2.5.1.
@item
This function returns 0 for all possible arguments on some platforms:
Linux libc5.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
On Windows platforms, @code{wchar_t} is a 16-bit type and therefore cannot
accommodate all Unicode characters.
@end itemize
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