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foreach (1,2,3,4) {
print "dir1\n" if glob("dir1/f*");
print "dir2\n" if glob("dir2/f*");
}

use strict;
...
8:     dir1/f2
9: 
10:     dir1/f1

use strict;
use warnings;
...
dir1/f1
dir1/f1
dir1/f1