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Learn how to diagnose why a Scala recursive function is not optimized as a tail call, verify the cause with a checklist, and apply targeted fixes using @tailrec, accumulators, or trampolines.
Learn how Scala's @tailrec annotation enforces tail‑call optimization, turning safe recursion into constant‑stack bytecode, with a concrete factorial example and verification steps.
Learn how Scala's @tailrec annotation guarantees tail‑call elimination, turning safe recursion into a loop and preventing StackOverflowError on large data.
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