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```
use v5.12;

...

foo();
bar();
```

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$ perl -MO=Concise -E'BEGIN { *DUMMY::GLOBAL::caller = sub {} }; calle
+r()'
4  <@> leave[1 ref] vKP/REFC ->(end)
...
-           <1> ex-rv2cv sK ->-
4              <#> gv[*CORE::GLOBAL::caller] s ->5
-e syntax OK