…trochenkov

Delegation: fix ICE on wrong `Self` instantiation

fixes rust-lang#119921
fixes rust-lang#119919

There is no way to instantiate `Self` param for caller in delegation item if

1. callee is a trait method && callee contains `Self` param
2. delegation item isn't an associative item

In general, we can consider `Self` param as independent type param in these cases:

```rust

trait Trait {
    fn foo(_: Option<&Self>) {...}
}

reuse Trait::foo;
// will be desugared to:
fn foo<T: Trait>(x: Option<&T>) { Trait::foo(x) }
```

But this requires early bound parameters support. For now, I suggest banning such cases to avoid ICE's.

r? `@petrochenkov`

…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#121943 (Clarify atomic bit validity)
 - rust-lang#123089 (Add invariant to VecDeque::pop_* that len < cap if pop successful)
 - rust-lang#123101 (Delegation: fix ICE on wrong `Self` instantiation)
 - rust-lang#123130 (Load missing type of impl associated constant from trait definition)
 - rust-lang#123133 (chore: fix some comments)
 - rust-lang#123136 (Some wording improvement)
 - rust-lang#123139 (`num::NonZero::get` can be 1 transmute instead of 2)
 - rust-lang#123142 (Let nils know about changes to target docs)

r? `@ghost`
`@rustbot` modify labels: rollup

…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#121943 (Clarify atomic bit validity)
 - rust-lang#123075 (CFI: Fix drop and drop_in_place)
 - rust-lang#123101 (Delegation: fix ICE on wrong `Self` instantiation)
 - rust-lang#123130 (Load missing type of impl associated constant from trait definition)
 - rust-lang#123133 (chore: fix some comments)
 - rust-lang#123136 (Some wording improvement)
 - rust-lang#123139 (`num::NonZero::get` can be 1 transmute instead of 2)
 - rust-lang#123142 (Let nils know about changes to target docs)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of rust-lang#123101 - Bryanskiy:delegation-fixes-2, r=petrochenkov

Delegation: fix ICE on wrong `Self` instantiation

fixes rust-lang#119921
fixes rust-lang#119919

There is no way to instantiate `Self` param for caller in delegation item if

1. callee is a trait method && callee contains `Self` param
2. delegation item isn't an associative item

In general, we can consider `Self` param as independent type param in these cases:

```rust

trait Trait {
    fn foo(_: Option<&Self>) {...}
}

reuse Trait::foo;
// will be desugared to:
fn foo<T: Trait>(x: Option<&T>) { Trait::foo(x) }
```

But this requires early bound parameters support. For now, I suggest banning such cases to avoid ICE's.

r? ``@petrochenkov``