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e6bd6c2044
Always use the `Fn(T) -> R` format when printing closure traits instead of `Fn<(T,), Output = R>`. Fix #67100: ``` error[E0277]: expected a `Fn()` closure, found `F` --> file.rs:6:13 | 6 | call_fn(f) | ------- ^ expected an `Fn()` closure, found `F` | | | required by a bound introduced by this call | = note: wrap the `F` in a closure with no arguments: `|| { /* code */ }` note: required by a bound in `call_fn` --> file.rs:1:15 | 1 | fn call_fn<F: Fn() -> ()>(f: &F) { | ^^^^^^^^^^ required by this bound in `call_fn` help: consider further restricting this bound | 5 | fn call_any<F: std::any::Any + Fn()>(f: &F) { | ++++++ ```
61 lines
2.5 KiB
Plaintext
61 lines
2.5 KiB
Plaintext
error[E0308]: mismatched types
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--> $DIR/fn-trait-formatting.rs:6:17
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LL | let _: () = Box::new(|_: isize| {}) as Box<dyn FnOnce(isize)>;
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| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `Box<dyn FnOnce(isize)>`
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| expected due to this
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= note: expected unit type `()`
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found struct `Box<dyn FnOnce(isize)>`
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help: use parentheses to call this trait object
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LL | let _: () = (Box::new(|_: isize| {}) as Box<dyn FnOnce(isize)>)(/* isize */);
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| + ++++++++++++++
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error[E0308]: mismatched types
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--> $DIR/fn-trait-formatting.rs:10:17
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LL | let _: () = Box::new(|_: isize, isize| {}) as Box<dyn Fn(isize, isize)>;
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| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `Box<dyn Fn(isize, isize)>`
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| expected due to this
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= note: expected unit type `()`
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found struct `Box<dyn Fn(isize, isize)>`
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help: use parentheses to call this trait object
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LL | let _: () = (Box::new(|_: isize, isize| {}) as Box<dyn Fn(isize, isize)>)(/* isize */, /* isize */);
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| + +++++++++++++++++++++++++++
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error[E0308]: mismatched types
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--> $DIR/fn-trait-formatting.rs:14:17
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LL | let _: () = Box::new(|| -> isize { unimplemented!() }) as Box<dyn FnMut() -> isize>;
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| -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `Box<dyn FnMut() -> isize>`
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| expected due to this
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= note: expected unit type `()`
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found struct `Box<dyn FnMut() -> isize>`
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error[E0277]: expected a `Fn(isize)` closure, found `{integer}`
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--> $DIR/fn-trait-formatting.rs:19:14
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LL | needs_fn(1);
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| -------- ^ expected an `Fn(isize)` closure, found `{integer}`
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| required by a bound introduced by this call
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= help: the trait `Fn(isize)` is not implemented for `{integer}`
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note: required by a bound in `needs_fn`
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--> $DIR/fn-trait-formatting.rs:1:31
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LL | fn needs_fn<F>(x: F) where F: Fn(isize) -> isize {}
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| ^^^^^^^^^^^^^^^^^^ required by this bound in `needs_fn`
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error: aborting due to 4 previous errors
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Some errors have detailed explanations: E0277, E0308.
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For more information about an error, try `rustc --explain E0277`.
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