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We may add freopen (actually, as an ANSI C facility, it deserves to be
in iolib), but we still must correct the problem of accessing a closed
stdin (even after a reopen).

I have attached a sample program for windows that shows how the
invalid stdxxx detection works.

However, what about in liolib.c of putting back the checks in f:close()
so that io.stdout is set to nil when we close it. It would seem to be
a simple solution that would generate consistent behaviour - no?

<sample prog>
#include <windows.h>
#include <stdio.h>

int main(int argc, char* argv[])
 h = _get_osfhandle(_fileno(stdout));
 fprintf(stderr, "handle %08X\n",h);
 return 0;