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stat'ing "/" vs "//"

Looks like current release of Cygwin stat returns 0 for both "/" and
"//" whereas MSVC and other POSIX runtimes produce -1 for "//". Is
this by design? My shortened version of POSIX doesn't say much about
leading "//" other than saying it's allowed. Can someone check what
the current dev version says?

Here's a trivial test case:

  #include <sys/types.h>
  #include <sys/stat.h>
  #include <stdio.h>

  main (int argc, char *argv[]) 
    struct stat s;
    printf ("stat (/) = %d\n", stat ("/", &s));
    printf ("stat (//) = %d\n", stat ("//", &s));
    return 0;