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for (1..4) {
   if (glob($0)) {
...
      print("I don't exist\n");
   }
}

I exist
I don't exist
I exist
I don't exist

for (1..4) {
   if (() = glob($0)) {
...
      print("I don't exist\n");
   }
}

for (1..4) {
   if (-e $0) {
...
      print("I don't exist\n");
   }
}

I exist
I exist
I exist
I exist