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@array = <FILE>;

while(<FILE>) {
    push(@array, $_);
}

open (DF, "test.txt") || die "Can't read 'test.txt': $!\n"

use strict;
use warnings;

perl -MO=Deparse -e 'open (DF, "test.txt") || die "Cant read test.txt\
+n";'

die "Can't read test.txt\n" unless open DF, 'test.txt';