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error: implementation of `FnOnce` is not general enough
  --> $DIR/drop-tracking-unresolved-typeck-results.rs:99:5
   |
LL | /     send(async {
LL | |
LL | |
LL | |
LL | |
LL | |         Next(&Buffered(Map(Empty(PhantomData), ready::<&()>), FuturesOrdered(PhantomData), 0)).await
LL | |     });
   | |______^ implementation of `FnOnce` is not general enough
   |
   = note: `fn(&'0 ()) -> std::future::Ready<&'0 ()> {std::future::ready::<&'0 ()>}` must implement `FnOnce<(&'1 (),)>`, for any two lifetimes `'0` and `'1`...
   = note: ...but it actually implements `FnOnce<(&(),)>`

error: implementation of `FnOnce` is not general enough
  --> $DIR/drop-tracking-unresolved-typeck-results.rs:99:5
   |
LL | /     send(async {
LL | |
LL | |
LL | |
LL | |
LL | |         Next(&Buffered(Map(Empty(PhantomData), ready::<&()>), FuturesOrdered(PhantomData), 0)).await
LL | |     });
   | |______^ implementation of `FnOnce` is not general enough
   |
   = note: `fn(&'0 ()) -> std::future::Ready<&'0 ()> {std::future::ready::<&'0 ()>}` must implement `FnOnce<(&'1 (),)>`, for any two lifetimes `'0` and `'1`...
   = note: ...but it actually implements `FnOnce<(&(),)>`

error: implementation of `FnOnce` is not general enough
  --> $DIR/drop-tracking-unresolved-typeck-results.rs:99:5
   |
LL | /     send(async {
LL | |
LL | |
LL | |
LL | |
LL | |         Next(&Buffered(Map(Empty(PhantomData), ready::<&()>), FuturesOrdered(PhantomData), 0)).await
LL | |     });
   | |______^ implementation of `FnOnce` is not general enough
   |
   = note: `fn(&'0 ()) -> std::future::Ready<&'0 ()> {std::future::ready::<&'0 ()>}` must implement `FnOnce<(&'1 (),)>`, for any two lifetimes `'0` and `'1`...
   = note: ...but it actually implements `FnOnce<(&(),)>`

error: implementation of `FnOnce` is not general enough
  --> $DIR/drop-tracking-unresolved-typeck-results.rs:99:5
   |
LL | /     send(async {
LL | |
LL | |
LL | |
LL | |
LL | |         Next(&Buffered(Map(Empty(PhantomData), ready::<&()>), FuturesOrdered(PhantomData), 0)).await
LL | |     });
   | |______^ implementation of `FnOnce` is not general enough
   |
   = note: `fn(&'0 ()) -> std::future::Ready<&'0 ()> {std::future::ready::<&'0 ()>}` must implement `FnOnce<(&'1 (),)>`, for any two lifetimes `'0` and `'1`...
   = note: ...but it actually implements `FnOnce<(&(),)>`

error: aborting due to 4 previous errors