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rust/tests/ui/lifetimes/issue-17728.stderr

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2020-01-05 00:17:46 +00:00
error[E0308]: `match` arms have incompatible types
2022-04-01 13:13:25 -04:00
--> $DIR/issue-17728.rs:108:14
|
LL | / match to_parse {
LL | | "w" | "west" => RoomDirection::West,
LL | | "e" | "east" => RoomDirection::East,
LL | | "n" | "north" => RoomDirection::North,
... |
LL | | "down" => RoomDirection::Down,
| | ------------------- this and all prior arms are found to be of type `RoomDirection`
LL | | _ => None
| | ^^^^ expected `RoomDirection`, found `Option<_>`
LL | | }
| |_____- `match` arms have incompatible types
|
2019-11-14 14:08:08 -08:00
= note: expected enum `RoomDirection`
found enum `Option<_>`
error: lifetime may not live long enough
--> $DIR/issue-17728.rs:15:28
|
LL | fn attemptTraverse(&self, room: &Room, directionStr: &str) -> Result<&Room, &str> {
| - - let's call the lifetime of this reference `'1`
| |
| let's call the lifetime of this reference `'2`
...
LL | Some(entry) => Ok(entry),
| ^^^^^^^^^ method was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1`
|
help: consider introducing a named lifetime parameter
|
Tweak suggested lifetimes to modify return type instead of `&self` receiver Do not suggest constraining the `&self` param, but rather the return type. If that is wrong (because it is not sufficient), a follow up error will tell the user to fix it. This way we lower the chances of *over* constraining, but still get the cake of "correctly" contrained in two steps. This is a correct suggestion: ``` error: lifetime may not live long enough --> $DIR/ex3-both-anon-regions-return-type-is-anon.rs:9:9 | LL | fn foo<'a>(&self, x: &i32) -> &i32 { | - - let's call the lifetime of this reference `'1` | | | let's call the lifetime of this reference `'2` LL | x | ^ method was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1` | help: consider introducing a named lifetime parameter and update trait if needed | LL | fn foo<'a>(&self, x: &'a i32) -> &'a i32 { | ++ ++ ``` While this is incomplete because it should suggestino `&'a self` ``` error: lifetime may not live long enough --> $DIR/ex3-both-anon-regions-self-is-anon.rs:7:19 | LL | fn foo<'a>(&self, x: &Foo) -> &Foo { | - - let's call the lifetime of this reference `'1` | | | let's call the lifetime of this reference `'2` LL | if true { x } else { self } | ^ method was supposed to return data with lifetime `'2` but it is returning data with lifetime `'1` | help: consider introducing a named lifetime parameter and update trait if needed | LL | fn foo<'a>(&self, x: &'a Foo) -> &'a Foo { | ++ ++ ``` but the follow up error is ``` error: lifetime may not live long enough --> tests/ui/lifetimes/lifetime-errors/ex3-both-anon-regions-self-is-anon.rs:7:30 | 6 | fn foo<'a>(&self, x: &'a Foo) -> &'a Foo { | -- - let's call the lifetime of this reference `'1` | | | lifetime `'a` defined here 7 | if true { x } else { self } | ^^^^ method was supposed to return data with lifetime `'a` but it is returning data with lifetime `'1` | help: consider introducing a named lifetime parameter and update trait if needed | 6 | fn foo<'a>(&'a self, x: &'a Foo) -> &'a Foo { | ++ ```
2024-05-07 19:54:16 +00:00
LL | fn attemptTraverse<'a>(&self, room: &'a Room, directionStr: &str) -> Result<&'a Room, &'a str> {
| ++++ ++ ++ ++
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0308`.