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core: Make `Debug` impl of raw pointers print metadata if present Make Rust pointers appear less magic by including metadata information in their `Debug` output. This does not break Rust stability guarantees because `Debug` impl are explicitly exempted from stability: https://doc.rust-lang.org/std/fmt/trait.Debug.html#stability > ## Stability > > Derived `Debug` formats are not stable, and so may change with future Rust versions. Additionally, `Debug` implementations of types provided by the standard library (`std`, `core`, `alloc`, etc.) are not stable, and may also change with future Rust versions. Note that a regression test is added as a separate commit to make it clear what impact the last commit has on the output. Closes #128684 because the output of that code now becomes: ``` thread 'main' panicked at src/main.rs:5:5: assertion `left == right` failed left: Pointer { addr: 0x7ffd45c6fc6b, metadata: 5 } right: Pointer { addr: 0x7ffd45c6fc6b, metadata: 3 } note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace ``` |
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