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        $a = $b or $c;     # bug: this is wrong
    ($a = $b) or $c;   # really means this
    $a = $b || $c;     # better written this way
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        @info = stat($file) || die;    # oops, scalar sense of stat!
    @info = stat($file) or die;    # better, now @info gets its due
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        open INFO, "< datafile"  or die "can't open datafile: $!";