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  1. or download this
    $ perl -MO=Concise,-exec -e'f() and g()'
    1  <0> enter v
    ...
    9      <1> entersub[t4] vKS/TARG
    a  <@> leave[1 ref] vKP/REFC
    -e syntax OK
    
  2. or download this
    $ perl -MO=Concise,-exec -e'if (!f()) { g() }'
    1  <0> enter v
    ...
    9      <1> entersub[t4] vKS/TARG
    a  <@> leave[1 ref] vKP/REFC
    -e syntax OK