Re: [PATCH 1/4] rust: add projection infrastructure

[Benno Lossin]

On Sat Feb 14, 2026 at 6:33 AM CET, Gary Guo wrote:
> +#[macro_export]
> +macro_rules! project_pointer {
> +    (@gen $ptr:ident, ) => {};
> +    // Field projection. `$field` needs to be `tt` to support tuple index like `.0`.
> +    (@gen $ptr:ident, .$field:tt $($rest:tt)*) => {
> +        // SAFETY: the provided closure always return in bounds pointer.
> +        let $ptr = unsafe {
> +            $crate::projection::ProjectField::proj($ptr, #[inline(always)] |ptr| {

By the way, how does this avoid `#![feature(stmt_expr_attributes)]`?

Cheers,
Benno

> +                // SAFETY: `$field` is in bounds, and no implicit `Deref` is possible (if the
> +                // type implements `Deref`, Rust cannot infer the generic parameter `DEREF`).
> +                &raw mut (*ptr).$field
> +            })
> +        };
> +        $crate::project_pointer!(@gen $ptr, $($rest)*)
> +    };