How does lifetime elision affect performance? I thought the compiler just inferr...

steveklabnik · 2026-01-02T00:53:34 1767315214

Strictly speaking, elision just adds lifetimes based on common patterns, so yes, it wouldn't directly affect performance.

I believe your parent is implying that if you skip using a lifetime and do something else instead to make it easier, that may be less performant.

ViewTrick1002 · 2026-01-02T12:37:14 1767357434

Exactly.

Cloning values, collecting iterators into Vecs and then continue the transformation rather than keeping it lazy all the way through. Skipping structs/enums with references.

adastra22 · 2026-01-02T11:45:57 1767354357

I think his point is the lifetime you’d put there is identical to the lifetime that is inferred/elided. So there is literally no difference.

steveklabnik · 2026-01-03T00:42:30 1767400950

I thought they meant the case where you go "ugh, I don't want to write a lifetime here" and then change your code, because you have to. If you don't have to, then yes, there's literally no difference.