Rollup merge of #97233 - c410-f3r:assert-lib, r=scottmcm

[RFC 2011] Library code

CC https://github.com/rust-lang/rust/pull/96496

Based on https://github.com/dtolnay/case-studies/tree/master/autoref-specialization.

Basically creates two traits with the same method name. One trait is generic over any `T` and the other is specialized to any `T: Printable`.

The compiler will then call the corresponding trait method through auto reference.

```rust
fn main() {
    let mut a = Capture::new();
    let mut b = Capture::new();

    (&Wrapper(&1i32)).try_capture(&mut a); // `try_capture` from `TryCapturePrintable`
    (&Wrapper(&vec![1i32])).try_capture(&mut b); // `try_capture` from `TryCaptureGeneric`

    assert_eq!(format!("{:?}", a), "1");
    assert_eq!(format!("{:?}", b), "N/A");
}
```

r? `@scottmcm`

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