error[E0277]: the `?` operator can only be used on `Result`s, not `Option`s, in a function that returns `Result`
--> $DIR/try-on-option.rs:5:6
|
-LL | / fn foo() -> Result<u32, ()> {
-LL | | let x: Option<u32> = None;
-LL | | x?;
- | | ^ use `.ok_or(...)?` to provide an error compatible with `Result<u32, ()>`
-LL | | Ok(22)
-LL | | }
- | |_- this function returns a `Result`
+LL | fn foo() -> Result<u32, ()> {
+ | --------------------------- this function returns a `Result`
+LL | let x: Option<u32> = None;
+LL | x?;
+ | ^ use `.ok_or(...)?` to provide an error compatible with `Result<u32, ()>`
|
= help: the trait `FromResidual<Option<Infallible>>` is not implemented for `Result<u32, ()>`
= help: the following other types implement trait `FromResidual<R>`:
error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
--> $DIR/try-on-option.rs:11:6
|
-LL | / fn bar() -> 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 `?`
+LL | fn bar() -> u32 {
+ | --------------- this function should return `Result` or `Option` to accept `?`
+LL | let x: Option<u32> = None;
+LL | x?;
+ | ^ cannot use the `?` operator in a function that returns `u32`
|
= help: the trait `FromResidual<Option<Infallible>>` is not implemented for `u32`