blob: ce3aca39fb8fb453184f075721c6604faeece6ed (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
|
error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `std::ops::Try`)
--> $DIR/try-on-option-diagnostics.rs:7:5
|
LL | / fn a_function() -> u32 {
LL | | let x: Option<u32> = None;
LL | | x?;
| | ^^ cannot use the `?` operator in a function that returns `u32`
LL | | 22
LL | | }
| |_- this function should return `Result` or `Option` to accept `?`
|
= help: the trait `std::ops::Try` is not implemented for `u32`
= note: required by `std::ops::Try::from_error`
error[E0277]: the `?` operator can only be used in a closure that returns `Result` or `Option` (or another type that implements `std::ops::Try`)
--> $DIR/try-on-option-diagnostics.rs:14:9
|
LL | let a_closure = || {
| _____________________-
LL | | let x: Option<u32> = None;
LL | | x?;
| | ^^ cannot use the `?` operator in a closure that returns `{integer}`
LL | | 22
LL | | };
| |_____- this function should return `Result` or `Option` to accept `?`
|
= help: the trait `std::ops::Try` is not implemented for `{integer}`
= note: required by `std::ops::Try::from_error`
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.
|
