Non-covariant types can already be accessed inside projections. As projections are only generated for `Pin<&mut T>`, they're not accessible otherwise. Add `with_{field_name}` methods so fields can be accessed using closures with just `&T`. Acked-by: Benno Lossin <lossin@kernel.org> Link: https://patch.msgid.link/20261008-dev-selfref-v2-17-e280b3c8fba5@garyguo.net/ Signed-off-by: Gary Guo <gary@garyguo.net>