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  1. or download this
    $ perl -MO=Concise,-exec -e'time()'
    1  <0> enter
    ...
    3  <0> time[t1] v                       <-- time operator
    4  <@> leave[1 ref] vKP/REFC
    -e syntax OK
    
  2. or download this
    $ perl -MO=Concise,-exec -e'BEGIN { *CORE::GLOBAL::time = sub {} } tim
    +e()'
    1  <0> enter
    ...
    5  <1> entersub[t2] vKS/TARG,1          <-- sub invocation
    6  <@> leave[1 ref] vKP/REFC
    -e syntax OK
    
  3. or download this
    $ perl -MO=Concise,-exec -e'use subs qw( time ); time()'
    1  <0> enter
    ...
    5  <1> entersub[t2] vKS/TARG,1          <-- sub invocation
    6  <@> leave[1 ref] vKP/REFC
    -e syntax OK