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1d52972dd8
Use parenthetical notation for `Fn` traits Always use the `Fn(T) -> R` format when printing closure traits instead of `Fn<(T,), Output = R>`. Address #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) { | ++++++ ```
35 lines
1.2 KiB
Plaintext
35 lines
1.2 KiB
Plaintext
error[E0229]: associated item constraints are not allowed here
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--> $DIR/issue-39259.rs:6:17
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LL | impl Fn(u32) -> u32 for S {
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| ^^^ associated item constraint not allowed here
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help: parenthesized trait syntax expands to `Fn<(u32,), Output=u32>`
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--> $DIR/issue-39259.rs:6:6
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LL | impl Fn(u32) -> u32 for S {
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| ^^^^^^^^^^^^^^
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error[E0277]: expected a `FnMut(u32)` closure, found `S`
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--> $DIR/issue-39259.rs:6:25
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LL | impl Fn(u32) -> u32 for S {
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| ^ expected an `FnMut(u32)` closure, found `S`
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= help: the trait `FnMut(u32)` is not implemented for `S`
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note: required by a bound in `Fn`
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--> $SRC_DIR/core/src/ops/function.rs:LL:COL
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error[E0050]: method `call` has 1 parameter but the declaration in trait `call` has 2
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--> $DIR/issue-39259.rs:9:13
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LL | fn call(&self) -> u32 {
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| ^^^^^ expected 2 parameters, found 1
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= note: `call` from trait: `extern "rust-call" fn(&Self, Args) -> <Self as FnOnce<Args>>::Output`
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0050, E0229, E0277.
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For more information about an error, try `rustc --explain E0050`.
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