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  1. or download this
    C:\test>perl -MO=Concise -E"my$x=-1; $x = $x<0?0:$x;"
    e  <@> leave[1 ref] vKP/REFC ->(end)
    ...
    a              <$> const[IV 0] s ->b
    b              <0> padsv[$x:46,47] sRM* ->c
    -e syntax OK