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  1. or download this
    qwurx [shmem] ~ > perl -MO=Concise,-exec -e 'use constant foo=>"5"; $c
    +=4+foo;'
    1  <0> enter 
    ...
    5  <2> sassign vKS/2
    6  <@> leave[1 ref] vKP/REFC
    -e syntax OK
    
  2. or download this
    qwurx [shmem] ~ > perl -MO=Concise,-exec -e 'sub foo(){"5"}; $c=4+foo;
    +'
    1  <0> enter 
    ...
    5  <2> sassign vKS/2
    6  <@> leave[1 ref] vKP/REFC
    -e syntax OK
    
  3. or download this
    qwurx [shmem] ~ > perl -MO=Concise,-exec -e 'sub foo{"5"}; $c=4+foo;'
    1  <0> enter 
    ...
    9  <2> sassign vKS/2
    a  <@> leave[1 ref] vKP/REFC
    -e syntax OK