mirror of https://github.com/rust-lang/rust
49 lines
2.1 KiB
Plaintext
49 lines
2.1 KiB
Plaintext
error[E0261]: use of undeclared lifetime name `'a`
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--> $DIR/fn-missing-lifetime-in-item.rs:1:33
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LL | struct S1<F: Fn(&i32, &i32) -> &'a i32>(F);
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| ^^ undeclared lifetime
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= note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
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help: consider making the bound lifetime-generic with a new `'a` lifetime
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LL | struct S1<F: for<'a> Fn(&i32, &i32) -> &'a i32>(F);
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| +++++++
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help: consider introducing lifetime `'a` here
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LL | struct S1<'a, F: Fn(&i32, &i32) -> &'a i32>(F);
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| +++
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error[E0106]: missing lifetime specifier
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--> $DIR/fn-missing-lifetime-in-item.rs:2:32
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LL | struct S2<F: Fn(&i32, &i32) -> &i32>(F);
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| ---- ---- ^ expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from argument 1 or argument 2
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help: consider making the bound lifetime-generic with a new `'a` lifetime
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LL | struct S2<F: for<'a> Fn(&'a i32, &'a i32) -> &'a i32>(F);
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| +++++++ ++ ++ ++
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help: consider introducing a named lifetime parameter
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LL | struct S2<'a, F: Fn(&'a i32, &'a i32) -> &'a i32>(F);
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| +++ ++ ++ ++
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error[E0582]: binding for associated type `Output` references lifetime `'a`, which does not appear in the trait input types
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--> $DIR/fn-missing-lifetime-in-item.rs:3:40
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LL | struct S3<F: for<'a> Fn(&i32, &i32) -> &'a i32>(F);
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| ^^^^^^^
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error[E0582]: binding for associated type `Output` references lifetime `'a`, which does not appear in the trait input types
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--> $DIR/fn-missing-lifetime-in-item.rs:6:55
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LL | const C: Option<Box<dyn for<'a> Fn(&usize, &usize) -> &'a usize>> = None;
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| ^^^^^^^^^
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error: aborting due to 4 previous errors
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Some errors have detailed explanations: E0106, E0261, E0582.
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For more information about an error, try `rustc --explain E0106`.
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