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) { | ++++++ ```
52 lines
2.6 KiB
Plaintext
52 lines
2.6 KiB
Plaintext
error[E0277]: expected a `Fn(&isize)` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
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--> $DIR/unboxed-closures-unsafe-extern-fn.rs:20:21
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LL | let x = call_it(&square, 22);
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| ------- ^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
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| |
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| required by a bound introduced by this call
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= help: the trait `for<'a> Fn(&'a isize)` is not implemented for fn item `for<'a> unsafe fn(&'a isize) -> isize {square}`
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= note: unsafe function cannot be called generically without an unsafe block
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note: required by a bound in `call_it`
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--> $DIR/unboxed-closures-unsafe-extern-fn.rs:9:15
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LL | fn call_it<F: Fn(&isize) -> isize>(_: &F, _: isize) -> isize {
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| ^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it`
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error[E0277]: expected a `FnMut(&isize)` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
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--> $DIR/unboxed-closures-unsafe-extern-fn.rs:25:25
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LL | let y = call_it_mut(&mut square, 22);
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| ----------- ^^^^^^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
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| required by a bound introduced by this call
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= help: the trait `for<'a> FnMut(&'a isize)` is not implemented for fn item `for<'a> unsafe fn(&'a isize) -> isize {square}`
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= note: unsafe function cannot be called generically without an unsafe block
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note: required by a bound in `call_it_mut`
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--> $DIR/unboxed-closures-unsafe-extern-fn.rs:12:19
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LL | fn call_it_mut<F: FnMut(&isize) -> isize>(_: &mut F, _: isize) -> isize {
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| ^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_mut`
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error[E0277]: expected a `FnOnce(&isize)` closure, found `for<'a> unsafe fn(&'a isize) -> isize {square}`
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--> $DIR/unboxed-closures-unsafe-extern-fn.rs:30:26
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LL | let z = call_it_once(square, 22);
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| ------------ ^^^^^^ call the function in a closure: `|| unsafe { /* code */ }`
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| required by a bound introduced by this call
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= help: the trait `for<'a> FnOnce(&'a isize)` is not implemented for fn item `for<'a> unsafe fn(&'a isize) -> isize {square}`
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= note: unsafe function cannot be called generically without an unsafe block
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note: required by a bound in `call_it_once`
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--> $DIR/unboxed-closures-unsafe-extern-fn.rs:15:20
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LL | fn call_it_once<F: FnOnce(&isize) -> isize>(_: F, _: isize) -> isize {
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| ^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `call_it_once`
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0277`.
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