Summary

Existing lint use_self check impl blocks for places where Self could be used instead of explicit repetition of type.

The same can be done with recursive structs. For example:

struct X { x: Option<Box<X>>, // <-- repetition }

struct X { x: Option<Box<Self>>, // <-- no repetition }

Self is very nice to have if the struct is modified to be generic.

struct X<'q, T: From<usize>> { t: &'q T, x: Option<Box<X<'q, T>>>, // <-- yuck }

Opened as false negative, but might also be a "feature-request in a trench coat" 😆

Lint Name

use_self

Reproducer

Should raise use_self:

struct X { x: Option<Box<X>>, // <-- Self }

struct X<'q, T: From<usize>> { t: &'q T, x: Option<Box<X<'q, T>>>, // <-- Self }

Version

rustc 1.91.0-nightly (6ba0ce409 2025-08-21) binary: rustc commit-hash: 6ba0ce40941eee1ca02e9ba49c791ada5158747a commit-date: 2025-08-21 host: x86_64-unknown-linux-gnu release: 1.91.0-nightly LLVM version: 21.1.0