rust/tests/ui/unsized/box-instead-of-dyn-fn.stderr
Nilstrieb 41e8d152dc Show number in error message even for one error
Co-authored-by: Adrian <adrian.iosdev@gmail.com>
2023-11-24 19:15:52 +01:00

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error[E0746]: return type cannot have an unboxed trait object
--> $DIR/box-instead-of-dyn-fn.rs:5:56
|
LL | fn print_on_or_the_other<'a>(a: i32, b: &'a String) -> dyn Fn() + 'a {
| ^^^^^^^^^^^^^ doesn't have a size known at compile-time
|
help: return an `impl Trait` instead of a `dyn Trait`, if all returned values are the same type
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LL | fn print_on_or_the_other<'a>(a: i32, b: &'a String) -> impl Fn() + 'a {
| ~~~~
help: box the return type, and wrap all of the returned values in `Box::new`
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LL ~ fn print_on_or_the_other<'a>(a: i32, b: &'a String) -> Box<dyn Fn() + 'a> {
LL |
LL | if a % 2 == 0 {
LL ~ Box::new(move || println!("{a}"))
|
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0746`.