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  1. or download this
    use strict;
if (@_)
...
 my $var = "ok";
}
print "$var\n";
  2. or download this
    Global symbol "$var" requires explicit package name at test2.pl line 6
+.
Execution of test2.pl aborted due to compilation errors.
  3. or download this
    use strict;
my $var = "ok" if (@_);
print "$var\n";