I've checked the source. Such things cannot be implemented with goto. And setjmp()/longjmp() is best explanation found in pod.
Implementation done using eval EXPR (EXPR is a string) + goto RANDOM_label. Each time you call sub recursively - label is different!

In reply to Re^6: Continuations in Perl - Returning to an arbitrary level up the call stack by vsespb
in thread Continuations in Perl - Returning to an arbitrary level up the call stack by unlinker

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