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error[E0271]: type mismatch resolving `<Result<Result<(), Result<Result<(), Result<Result<(), Option<{integer}>>, ...>>, ...>>, ...> as Future>::Error == Foo`
╭▸ $DIR/E0271.rs:20:5
│
LL │ ┏ Box::new(
LL │ ┃ Ok::<_, ()>(
LL │ ┃ Err::<(), _>(
LL │ ┃ Ok::<_, ()>(
‡ ┃
LL │ ┃ )
│ ┗━━━━━┛ type mismatch resolving `<Result<Result<(), Result<Result<(), ...>, ...>>, ...> as Future>::Error == Foo`
╰╴
note: expected this to be `Foo`
╭▸ $DIR/E0271.rs:10:18
│
LL │ type Error = E;
│ ━
╰ note: required for the cast from `Box<Result<Result<(), Result<Result<(), Result<Result<(), Option<{integer}>>, ()>>, ()>>, ()>>` to `Box<(dyn Future<Error = Foo> + 'static)>`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0271`.
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