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  1. or download this
    use Devel::Peek;
$! = 0.0;
...
stat("non_existing_file");
Dump($!);
die "died at second stat" if -$!;
  2. or download this
    SV = PVMG(0x82c690) at 0x803478
  REFCNT = 1
...
    MG_LEN = 1
    MG_PTR = 0x8032d0 "!"
died at first stat at bug.pl line 6.