b7a23bc08b
When we encounter a function with a return type that has an anonymous
lifetime with no argument to borrow from, besides suggesting the
`'static` lifetime we now also suggest changing the arguments to be
borrows or changing the return type to be an owned type.
```
error[E0106]: missing lifetime specifier
--> $DIR/variadic-ffi-6.rs:7:6
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LL | ) -> &usize {
| ^ expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`
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LL | ) -> &'static usize {
| +++++++
help: instead, you are more likely to want to change one of the arguments to be borrowed...
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LL | x: &usize,
| +
help: ...or alternatively, to want to return an owned value
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LL - ) -> &usize {
LL + ) -> usize {
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```
Fix #85843.
52 lines
1.9 KiB
Plaintext
52 lines
1.9 KiB
Plaintext
error[E0106]: missing lifetime specifier
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--> $DIR/impl-fn-hrtb-bounds.rs:19:38
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LL | fn d() -> impl Fn() -> (impl Debug + '_) {
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| ^^ expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
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help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`, or if you will only have owned values
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LL | fn d() -> impl Fn() -> (impl Debug + 'static) {
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| ~~~~~~~
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error: higher kinded lifetime bounds on nested opaque types are not supported yet
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--> $DIR/impl-fn-hrtb-bounds.rs:4:41
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LL | fn a() -> impl Fn(&u8) -> (impl Debug + '_) {
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| ^^
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note: lifetime declared here
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--> $DIR/impl-fn-hrtb-bounds.rs:4:19
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LL | fn a() -> impl Fn(&u8) -> (impl Debug + '_) {
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| ^
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error: higher kinded lifetime bounds on nested opaque types are not supported yet
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--> $DIR/impl-fn-hrtb-bounds.rs:9:52
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LL | fn b() -> impl for<'a> Fn(&'a u8) -> (impl Debug + 'a) {
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| ^^
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note: lifetime declared here
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--> $DIR/impl-fn-hrtb-bounds.rs:9:20
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LL | fn b() -> impl for<'a> Fn(&'a u8) -> (impl Debug + 'a) {
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| ^^
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error: higher kinded lifetime bounds on nested opaque types are not supported yet
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--> $DIR/impl-fn-hrtb-bounds.rs:14:52
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LL | fn c() -> impl for<'a> Fn(&'a u8) -> (impl Debug + '_) {
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| ^^
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note: lifetime declared here
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--> $DIR/impl-fn-hrtb-bounds.rs:14:20
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LL | fn c() -> impl for<'a> Fn(&'a u8) -> (impl Debug + '_) {
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| ^^
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error: aborting due to 4 previous errors
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For more information about this error, try `rustc --explain E0106`.
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