Temporarily accept [i|u][32|size] suffixes on a tuple index and warn

Fix rust-lang#60138.

rust-lang#59553 will need to be kept open to track the change back to rejecting this code a few versions down thee line.

Temporarily accept [i|u][32|size] suffixes on a tuple index and warn

Fix rust-lang#60138.

rust-lang#59553 will need to be kept open to track the change back to rejecting this code a few versions down thee line.

Rollup of 5 pull requests

Successful merges:

 - #56278 (Future-proof MIR for dedicated debuginfo.)
 - #59739 (Stabilize futures_api)
 - #59822 (Fix dark css rule)
 - #60186 (Temporarily accept [i|u][32|size] suffixes on a tuple index and warn)
 - #60190 (Don't generate unnecessary rmeta files.)

Failed merges:

r? @ghost

[beta] Rollup backports

Cherry-picked:

* #59886:  musl: do not compress debug section
* #59891:  Fix the link to sort_by_cached_key
* #59911: Revert "compile crates under test w/ -Zemit-stack-sizes"
* #59978: rustdoc: Remove default keyword from re-exported trait methods
* #59989: Fix links to Atomic* in RELEASES.md
* #60186: Temporarily accept [i|u][32|size] suffixes on a tuple index and warn
* #60309: Add 1.34.1 release notes

Rolled up:

* #60273: [beta] bootstrap; remove redundant imports.

r? @ghost

Reject invalid literal suffixes in tuple indexing, tuple struct indexing, and struct field name position

Tracking issue: rust-lang#60210
Closes rust-lang#60210

## Summary

Bump the ["suffixes on a tuple index are invalid" non-lint pseudo future-incompatibility warning (rust-lang#60210)][issue-60210][^non-lint] to a **hard error** across all editions, rejecting the remaining carve outs from accidentally accepted invalid suffixes since Rust **1.27**.

- We accidentally accepted invalid suffixes in tuple indexing positions in Rust **1.27**. Originally reported at rust-lang#59418.
- We tried to hard reject all invalid suffixes in rust-lang#59421, but unfortunately it turns out there were proc macros accidentally relying on it: rust-lang#60138.
- We temporarily accepted `{i,u}{32,size}` in rust-lang#60186 (the "*carve outs*") to mitigate *immediate* ecosystem impact, but it came with an FCW warning indicating that we wanted to reject it after a few Rust releases.
- Now (1.89.0) is a few Rust releases later (1.35.0), thus I'm proposing to **also reject the carve outs**.
    - `std::mem::offset_of!` stabilized in Rust **1.77.0** happens to use the same "don't expect suffix" code path which has the carve outs, so it also accepted the carve out suffixes. I'm proposing to **reject this case as well**.

## What specifically breaks?

Code that still relied on invalid `{i,u}{32,size}` suffixes being temporarily accepted by rust-lang#60186 as an ecosystem impact mitigation measure (cf. rust-lang#60138). Specifically, the following cases (particularly the construction of these forms in proc macros like reported in rust-lang#60138):

### Position 1: Invalid `{i,u}{32,size}` suffixes in tuple indexing

```rs
fn main() {
    let _x = (42,).0invalid; // Already error, already rejected by rust-lang#59421
    let _x = (42,).0i8;      // Already error, not one of the rust-lang#60186 carve outs.
    let _x = (42,).0usize;   // warning: suffixes on a tuple index are invalid
}
```

### Position 2: Invalid `{i,u}{32,size}` suffixes in tuple struct indexing

```rs
fn main() {
    struct X(i32);
    let _x = X(42);
	let _x = _x.0invalid; // Already error, already rejected by rust-lang#59421
    let _x = _x.0i8;      // Already error, not one of the rust-lang#60186 carve outs.
    let _x = _x.0usize;   // warning: suffixes on a tuple index are invalid
}
```

### Position 3: Invalid `{i,u}{32,size}` suffixes in numeric struct field names

```rs
fn main() {
    struct X(i32, i32, i32);
    let _x = X(1, 2, 3);
    let _y = X { 0usize: 42, 1: 42, 2: 42 };    // warning: suffixes on a tuple index are invalid
	match _x {
        X { 0usize: 1, 1: 2, 2: 3 } => todo!(), // warning: suffixes on a tuple index are invalid
        _ => {}
    }
}
```

### Position 4: Invalid `{i,u}{32,size}` suffixes in `std::mem::offset_of!`

While investigating the warning, unfortunately I noticed `std::mem::offset_of!` also happens to use the "expect no suffix" code path which had the carve outs. So this was accepted since Rust **1.77.0** with the same FCW:

```rs
fn main() {
    #[repr(C)]
    pub struct Struct<T>(u8, T);

    assert_eq!(std::mem::offset_of!(Struct<u32>, 0usize), 0);
    //~^ WARN suffixes on a tuple index are invalid
}
```

### The above forms in proc macros

For instance, constructions like (see tracking issue rust-lang#60210):

```rs
let i = 0;
quote! { foo.$i }
```

where the user needs to actually write

```rs
let i = syn::Index::from(0);
quote! { foo.$i }
```

### Crater results

Conducted a crater run (rust-lang#145463 (comment)).

- https://github.com/AmlingPalantir/r4/tree/256af3c72f094b298cd442097ef7c571d8001f29: genuine regression; "invalid suffix `usize`" in derive macro. Has a ton of other build warnings, last updated 6 years ago.
    - Exactly the kind of intended breakage. Minimized down to https://github.com/AmlingPalantir/r4/blob/256af3c72f094b298cd442097ef7c571d8001f29/validates_derive/src/lib.rs#L71-L75, where when interpolation uses `quote`'s `ToTokens` on a `usize` index (i.e. on tuple struct `Tup(())`), the generated suffix becomes `.0usize` (cf. Position 2).
    - Notified crate author of breakage in AmlingPalantir/r4#1.
- Other failures are unrelated or spurious.

## Review remarks

- Commits 1-3 expands the test coverage to better reflect the current situation before doing any functional changes.
- Commit 4 is an intentional **breaking change**. We bump the non-lint "suffixes on a tuple index are invalid" warning into a hard error. Thus, this will need a crater run and a T-lang FCP.

## Tasks

- [x] Run crater to check if anyone is still relying on this being not a hard error. Determine degree of ecosystem breakage.
- [x] If degree of breakage seems acceptable, draft nomination report for T-lang for FCP.
- [x] Determine hard error on Edition 2024+, or on all editions.

## Accompanying Reference update

- rust-lang/reference#1966

[^non-lint]: The FCW was implemented as a *non-lint* warning (meaning it has no associated lint name, and you can't `#![deny(..)]` it) because spans coming from proc macros could not be distinguished from regular field access. This warning was also intentionally impossible to silence. See rust-lang#60186 (comment).

[issue-60210]: rust-lang#60210

Rollup merge of #145463 - jieyouxu:error-suffix, r=fmease

Reject invalid literal suffixes in tuple indexing, tuple struct indexing, and struct field name position

Tracking issue: #60210
Closes #60210

## Summary

Bump the ["suffixes on a tuple index are invalid" non-lint pseudo future-incompatibility warning (#60210)][issue-60210][^non-lint] to a **hard error** across all editions, rejecting the remaining carve outs from accidentally accepted invalid suffixes since Rust **1.27**.

- We accidentally accepted invalid suffixes in tuple indexing positions in Rust **1.27**. Originally reported at #59418.
- We tried to hard reject all invalid suffixes in #59421, but unfortunately it turns out there were proc macros accidentally relying on it: #60138.
- We temporarily accepted `{i,u}{32,size}` in #60186 (the "*carve outs*") to mitigate *immediate* ecosystem impact, but it came with an FCW warning indicating that we wanted to reject it after a few Rust releases.
- Now (1.89.0) is a few Rust releases later (1.35.0), thus I'm proposing to **also reject the carve outs**.
    - `std::mem::offset_of!` stabilized in Rust **1.77.0** happens to use the same "don't expect suffix" code path which has the carve outs, so it also accepted the carve out suffixes. I'm proposing to **reject this case as well**.

## What specifically breaks?

Code that still relied on invalid `{i,u}{32,size}` suffixes being temporarily accepted by #60186 as an ecosystem impact mitigation measure (cf. #60138). Specifically, the following cases (particularly the construction of these forms in proc macros like reported in #60138):

### Position 1: Invalid `{i,u}{32,size}` suffixes in tuple indexing

```rs
fn main() {
    let _x = (42,).0invalid; // Already error, already rejected by #59421
    let _x = (42,).0i8;      // Already error, not one of the #60186 carve outs.
    let _x = (42,).0usize;   // warning: suffixes on a tuple index are invalid
}
```

### Position 2: Invalid `{i,u}{32,size}` suffixes in tuple struct indexing

```rs
fn main() {
    struct X(i32);
    let _x = X(42);
	let _x = _x.0invalid; // Already error, already rejected by #59421
    let _x = _x.0i8;      // Already error, not one of the #60186 carve outs.
    let _x = _x.0usize;   // warning: suffixes on a tuple index are invalid
}
```

### Position 3: Invalid `{i,u}{32,size}` suffixes in numeric struct field names

```rs
fn main() {
    struct X(i32, i32, i32);
    let _x = X(1, 2, 3);
    let _y = X { 0usize: 42, 1: 42, 2: 42 };    // warning: suffixes on a tuple index are invalid
	match _x {
        X { 0usize: 1, 1: 2, 2: 3 } => todo!(), // warning: suffixes on a tuple index are invalid
        _ => {}
    }
}
```

### Position 4: Invalid `{i,u}{32,size}` suffixes in `std::mem::offset_of!`

While investigating the warning, unfortunately I noticed `std::mem::offset_of!` also happens to use the "expect no suffix" code path which had the carve outs. So this was accepted since Rust **1.77.0** with the same FCW:

```rs
fn main() {
    #[repr(C)]
    pub struct Struct<T>(u8, T);

    assert_eq!(std::mem::offset_of!(Struct<u32>, 0usize), 0);
    //~^ WARN suffixes on a tuple index are invalid
}
```

### The above forms in proc macros

For instance, constructions like (see tracking issue #60210):

```rs
let i = 0;
quote! { foo.$i }
```

where the user needs to actually write

```rs
let i = syn::Index::from(0);
quote! { foo.$i }
```

### Crater results

Conducted a crater run (#145463 (comment)).

- https://github.com/AmlingPalantir/r4/tree/256af3c72f094b298cd442097ef7c571d8001f29: genuine regression; "invalid suffix `usize`" in derive macro. Has a ton of other build warnings, last updated 6 years ago.
    - Exactly the kind of intended breakage. Minimized down to https://github.com/AmlingPalantir/r4/blob/256af3c72f094b298cd442097ef7c571d8001f29/validates_derive/src/lib.rs#L71-L75, where when interpolation uses `quote`'s `ToTokens` on a `usize` index (i.e. on tuple struct `Tup(())`), the generated suffix becomes `.0usize` (cf. Position 2).
    - Notified crate author of breakage in AmlingPalantir/r4#1.
- Other failures are unrelated or spurious.

## Review remarks

- Commits 1-3 expands the test coverage to better reflect the current situation before doing any functional changes.
- Commit 4 is an intentional **breaking change**. We bump the non-lint "suffixes on a tuple index are invalid" warning into a hard error. Thus, this will need a crater run and a T-lang FCP.

## Tasks

- [x] Run crater to check if anyone is still relying on this being not a hard error. Determine degree of ecosystem breakage.
- [x] If degree of breakage seems acceptable, draft nomination report for T-lang for FCP.
- [x] Determine hard error on Edition 2024+, or on all editions.

## Accompanying Reference update

- rust-lang/reference#1966

[^non-lint]: The FCW was implemented as a *non-lint* warning (meaning it has no associated lint name, and you can't `#![deny(..)]` it) because spans coming from proc macros could not be distinguished from regular field access. This warning was also intentionally impossible to silence. See #60186 (comment).

[issue-60210]: #60210