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  1. or download this
    ## try.pl ##
use warnings;
...
        print "From perl: $i\n";
        foo(++$i);
}
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    From perl: 0
From C: 1
...
From C: 7
From perl: 8
From C: 9
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    From C: 1
From C: 3
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From perl: 4
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From perl: 8