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) {
| ++++++
```
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) {
| ++++++
```
We already handle this case this way on the coherence side, and it matches the new solver's behaviour. While there is some breakage around type-alias-impl-trait (see new "type annotations needed" in tests/ui/type-alias-impl-trait/issue-84660-unsoundness.rs), no stable code breaks, and no new stable code is accepted.
Lazily normalize inside trait ref during orphan check & consider ty params in rigid alias types to be uncovered
Fixes#99554, fixesrust-lang/types-team#104.
Fixes#114061.
Supersedes #100555.
Tracking issue for the future compatibility lint: #124559.
r? lcnr
In `pretty_print_type()`, print `async fn` futures' paths instead of spans.
This makes `-Zprint-type-sizes`'s output easier to read, because the name of an `async fn` is more immediately recognizable than its span. This change will also synergize with my other `-Zprint-type-sizes` PR #122922 which prints the type of child futures being awaited.
I also deleted the comment "FIXME(eddyb) should use `def_span`." because it appears to have already been fixed by commit 67727aa7c3.
This makes `-Zprint-type-sizes`'s output easier to read, because the
name of an `async fn` is more immediately recognizable than its span.
I also deleted the comment "FIXME(eddyb) should use `def_span`." because
it appears to have already been fixed by commit 67727aa7c3.
Add a regression test for #117310Closes#117310
It seems to have been fixed in `rustc 1.79.0-nightly (1388d7a06 2024-03-20)` or before, so just adding a regression test for it.
Strip placeholders from hidden types before remapping generic parameter
When remapping generic parameters in the hidden type to the generic parameters of the definition of the opaque, we assume that placeholders cannot exist. Instead of just patching that site, I decided to handle it earlier, directly in `infer_opaque_types`, where we are already doing all the careful lifetime handling.
fixes#122694
the reason that ICE now occurred was that we stopped treating `operation` as being in the defining scope, so the TAIT became part of the hidden type of the `async fn`'s opaque type instead of just bailing out as ambiguos
I think
```rust
use std::future::Future;
mod foo {
type FutNothing<'a> = impl 'a + Future<Output = ()>;
//~^ ERROR: unconstrained opaque type
}
async fn operation(_: &mut ()) -> () {
//~^ ERROR: concrete type differs from previous
call(operation).await
//~^ ERROR: concrete type differs from previous
}
async fn call<F>(_f: F)
where
for<'any> F: FnMut(&'any mut ()) -> foo::FutNothing<'any>,
{
//~^ ERROR: expected generic lifetime parameter, found `'any`
}
```
would have already had the same ICE before https://github.com/rust-lang/rust/pull/121796
