in reply to Re^4: compilation error on 5.8 with $^V gt 'v5.10.0'
in thread compilation error on 5.8 with $^V gt 'v5.10.0'

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.

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