rust: pin-init: internal: pin_data: add `with_project` method

The `project` method needs to perform covariant coercion on covariant
fields, causing them to no longer being mutable. Implement a `with_project`
that does not require covariant coercion by using higher-ranked trait
bounds, thus allow the fields to be assignable inside the callback.

This mechanism can also be used to access non-covariant fields.

Acked-by: Benno Lossin <lossin@kernel.org>
Link: https://patch.msgid.link/20261008-dev-selfref-v2-10-e280b3c8fba5@garyguo.net/
Signed-off-by: Gary Guo <gary@garyguo.net>

0 files changed, 0 insertions, 0 deletions