bjoernager/rust
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Use parenthetical notation for Fn traits

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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) {
  |                              ++++++
```
This commit is contained in:
Esteban Küber 2024-05-29 21:42:40 +00:00
parent 8c4db851a7
commit e6bd6c2044
43 changed files with 89 additions and 88 deletions
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4
tests/ui/rfcs/rfc-2632-const-trait-impl/const-closure-trait-method-fail.stderr
View file

@ -13,8 +13,8 @@ LL | x(())
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
|
LL | const fn need_const_closure<T: ~const FnOnce(()) -> i32 + ~const std::ops::FnOnce<((),)>>(x: T) -> i32 {
| ++++++++++++++++++++++++++++++++
LL | const fn need_const_closure<T: ~const FnOnce(()) -> i32 + ~const FnOnce(())>(x: T) -> i32 {
| +++++++++++++++++++
help: add `#![feature(effects)]` to the crate attributes to enable
|
LL + #![feature(effects)]

4
tests/ui/rfcs/rfc-2632-const-trait-impl/const-closure-trait-method.stderr
View file

@ -13,8 +13,8 @@ LL | x(())
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
|
LL | const fn need_const_closure<T: ~const FnOnce(()) -> i32 + ~const std::ops::FnOnce<((),)>>(x: T) -> i32 {
| ++++++++++++++++++++++++++++++++
LL | const fn need_const_closure<T: ~const FnOnce(()) -> i32 + ~const FnOnce(())>(x: T) -> i32 {
| +++++++++++++++++++
help: add `#![feature(effects)]` to the crate attributes to enable
|
LL + #![feature(effects)]

12
tests/ui/rfcs/rfc-2632-const-trait-impl/const-closures.stderr
View file

@ -31,8 +31,8 @@ LL | f() + f()
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
|
LL | const fn answer<F: ~const Fn() -> u8 + ~const std::ops::Fn<()>>(f: &F) -> u8 {
| +++++++++++++++++++++++++
LL | const fn answer<F: ~const Fn() -> u8 + ~const Fn()>(f: &F) -> u8 {
| +++++++++++++
help: add `#![feature(effects)]` to the crate attributes to enable
|
LL + #![feature(effects)]
@ -47,8 +47,8 @@ LL | f() + f()
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
|
LL | const fn answer<F: ~const Fn() -> u8 + ~const std::ops::Fn<()>>(f: &F) -> u8 {
| +++++++++++++++++++++++++
LL | const fn answer<F: ~const Fn() -> u8 + ~const Fn()>(f: &F) -> u8 {
| +++++++++++++
help: add `#![feature(effects)]` to the crate attributes to enable
|
LL + #![feature(effects)]
@ -63,8 +63,8 @@ LL | f() * 7
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
help: consider further restricting this bound
|
LL | F: ~const FnOnce() -> u8 + ~const std::ops::Fn<()>,
| +++++++++++++++++++++++++
LL | F: ~const FnOnce() -> u8 + ~const Fn(),
| +++++++++++++
help: add `#![feature(effects)]` to the crate attributes to enable
|
LL + #![feature(effects)]