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error[E0308]: mismatched types
--> $DIR/suggest-box.rs:4:47
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LL | let _x: Box<dyn Fn() -> Result<(), ()>> = || {
| _____________-------------------------------___^
| | |
| | expected due to this
LL | | Err(())?;
LL | | Ok(())
LL | | };
| |_____^ expected `Box<dyn Fn() -> Result<(), ()>>`, found closure
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= note: expected struct `Box<dyn Fn() -> Result<(), ()>>`
found closure `{closure@$DIR/suggest-box.rs:4:47: 4:49}`
= note: for more on the distinction between the stack and the heap, read https://doc.rust-lang.org/book/ch15-01-box.html, https://doc.rust-lang.org/rust-by-example/std/box.html, and https://doc.rust-lang.org/std/boxed/index.html
help: store this in the heap by calling `Box::new`
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LL ~ let _x: Box<dyn Fn() -> Result<(), ()>> = Box::new(|| {
LL | Err(())?;
LL | Ok(())
LL ~ });
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error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.
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