error[E0308]: mismatched types --> $DIR/issue-99914.rs:9:27 | LL | t.and_then(|t| -> _ { bar(t) }); | ^^^^^^ expected `Result<_, Error>`, found future | help: try wrapping the expression in `Ok` | LL | t.and_then(|t| -> _ { Ok(bar(t)) }); | +++ + error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.