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error: lifetime may not live long enough
  --> $DIR/issue-76547.rs:20:13
   |
LL | async fn fut(bufs: &mut [&mut [u8]]) {
   |                    -     - let's call the lifetime of this reference `'2`
   |                    |
   |                    let's call the lifetime of this reference `'1`
LL |     ListFut(bufs).await
   |             ^^^^ this usage requires that `'1` must outlive `'2`
   |
help: consider introducing a named lifetime parameter
   |
LL | async fn fut<'a>(bufs: &'a mut [&'a mut [u8]]) {
   |             ++++        ++       ++

error: lifetime may not live long enough
  --> $DIR/issue-76547.rs:34:14
   |
LL | async fn fut2(bufs: &mut [&mut [u8]]) -> i32 {
   |                     -     - let's call the lifetime of this reference `'2`
   |                     |
   |                     let's call the lifetime of this reference `'1`
LL |     ListFut2(bufs).await
   |              ^^^^ this usage requires that `'1` must outlive `'2`
   |
help: consider introducing a named lifetime parameter
   |
LL | async fn fut2<'a>(bufs: &'a mut [&'a mut [u8]]) -> i32 {
   |              ++++        ++       ++

error: aborting due to 2 previous errors