mirror of https://github.com/rust-lang/rust
46 lines
1.3 KiB
Plaintext
46 lines
1.3 KiB
Plaintext
error[E0308]: mismatched types
|
|
--> $DIR/option-ref-advice.rs:6:18
|
|
|
|
|
LL | takes_option(&None);
|
|
| ------------ ^^^^^ expected `Option<&String>`, found `&Option<_>`
|
|
| |
|
|
| arguments to this function are incorrect
|
|
|
|
|
= note: expected enum `Option<&String>`
|
|
found reference `&Option<_>`
|
|
note: function defined here
|
|
--> $DIR/option-ref-advice.rs:3:4
|
|
|
|
|
LL | fn takes_option(_arg: Option<&String>) {}
|
|
| ^^^^^^^^^^^^ ---------------------
|
|
help: consider removing the borrow
|
|
|
|
|
LL - takes_option(&None);
|
|
LL + takes_option(None);
|
|
|
|
|
|
|
error[E0308]: mismatched types
|
|
--> $DIR/option-ref-advice.rs:10:18
|
|
|
|
|
LL | takes_option(&res);
|
|
| ------------ ^^^^ expected `Option<&String>`, found `&Option<String>`
|
|
| |
|
|
| arguments to this function are incorrect
|
|
|
|
|
= note: expected enum `Option<&String>`
|
|
found reference `&Option<String>`
|
|
note: function defined here
|
|
--> $DIR/option-ref-advice.rs:3:4
|
|
|
|
|
LL | fn takes_option(_arg: Option<&String>) {}
|
|
| ^^^^^^^^^^^^ ---------------------
|
|
help: try using `.as_ref()` to convert `&Option<String>` to `Option<&String>`
|
|
|
|
|
LL - takes_option(&res);
|
|
LL + takes_option(res.as_ref());
|
|
|
|
|
|
|
error: aborting due to 2 previous errors
|
|
|
|
For more information about this error, try `rustc --explain E0308`.
|