rust/tests/ui/unboxed-closures/unboxed-closures-unsafe-extern-fn.stderr
Esteban Küber e6bd6c2044 Use parenthetical notation for Fn traits
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) {
  |                              ++++++
```
2024-05-29 22:26:54 +00:00

52 lines
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Plaintext

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