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```
  perl -e 'undef %::; sub{}->()'
```

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perl -e 'delete $::{"@"}; warn'      ;# crashes
perl -e 'delete $::{"@"}; sub{}->()' ;# doesn't crash

perl -e 'delete $::{"_"}; warn'      ;# doesn't crash
perl -e 'delete $::{"_"}; sub{}->()' ;# crashes