ffdb471872
On borrow return type, suggest borrowing from arg or owned return type
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.
21 lines
751 B
Plaintext
21 lines
751 B
Plaintext
error[E0106]: missing lifetime specifier
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--> $DIR/foreign-fn-return-lifetime.rs:3:19
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LL | pub fn f() -> &u8;
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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`
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LL | pub fn f() -> &'static u8;
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| +++++++
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help: instead, you are more likely to want to return an owned value
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LL - pub fn f() -> &u8;
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LL + pub fn f() -> u8;
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0106`.
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