[PATCH 1/4] rust: macros: extend custom `quote!()` macro

[Alexandre Courbot]

On Sun Aug 3, 2025 at 11:20 PM JST, Jesung Yang wrote:
> Implement the `ToTokens` trait for `&T` where `T` implements `ToTokens`.
> This allows users to use the `quote!()` macro with references directly,
> avoiding the need to clone values.
>
> Extend the `quote_spanned!()` macro to support additional punctuation
> tokens: `->`, `<`, `>`, and `==`. This symbols are commonly needed when
> dealing with functions, generic bounds, and equality comparisons.

These two paragraphs feel like they should be split into separate
patches, as they are not related to one another AFAICT.