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  1. or download this
    package Scalar::Annotated;

...
}

__PACKAGE__
  2. or download this
    use 5.010;
use strict;
...
say '$quux is now ', $quux;
say '$quux was calculated as ', $quux->derivation;
  3. or download this
    $quux is 2
$quux was calculated as ((2 × (($foo + $bar) - 1)) mod $foo)
$quux is now 4
$quux was calculated as ($quux × 2)