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  1. or download this
    >perl -MO=Concise,-exec -e"while (1) {}"
1  <0> enter
...
4  <0> stub v
5  <0> unstack v
-e syntax OK
  2. or download this
    >perl -MO=Concise,-exec -e"for (;;) {}"
1  <0> enter
...
4  <0> stub v
5  <0> unstack v
-e syntax OK