Miss Dada  🏳️‍⚧️

for future reference, i needed a signature of <'a, 'b: 'a, P: 'a + 'b + std::clone::Clone>

you using arenas or something? (mostly curious to see what caused this, been looking for good examples to motivate multiple lifetimes with bounds)

here's a reduced example https://gist.github.com/tef/7027834f7349437e8d201607019803e2 … although that might not explain *why* i am doing it, but *what*, at least

i have some shared arena, i create a not-shared collector/session, then create transactions with mut ref to session & ref to arena let mut arena = ... let mut session = arena.session(); { let mut txn = session.txn() // or arena.transaction(&mut session) ... }

the reason is that i wanted to decouple collection lifetime from transaction lifetime, but also wanted to ensure that collectors wouldn't be shared across transactions, so i can do non atomic vecs to keep deleted objects

this was an absolute pain in the ass to find out how to do it because certain things *seemed* to work but didn't