Given that "erstwhile" means "former", an "erstwhile successor" doesn't seem to be logically possible
You're forgetting about time travel. Classic rookie mistake. In one alternate future, sundialsvc4 could had have had been his erstwhile successor.

In reply to Re^5: compilation error on 5.8 with $^V gt 'v5.10.0' by eyepopslikeamosquito
in thread compilation error on 5.8 with $^V gt 'v5.10.0' by gabrielsousa

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