Expected opaque type, found a different opaque type when trying futures::join_all

help
3

futures::join! works but I wanted a vector because I don't know a priori how many futures I need. I've tried Box::pin and Box::new but both give the same opaque type error. Probably I'm doing something wrong?

let futures = vec![
        Box::pin(get_blobs_from_data(pool, &blobs)),
        Box::pin(get_blobs_from_table(pool, &blobs, "TestTable")),
    ];