error[E0616]: field `inner` of struct `std::sync::Mutex` is private --> $DIR/issue-54062.rs:10:24 | LL | let _ = test.comps.inner.lock().unwrap(); | ^^^^^ private field error[E0599]: no method named `unwrap` found for struct `std::sys_common::mutex::MutexGuard<'_>` in the current scope --> $DIR/issue-54062.rs:10:37 | LL | let _ = test.comps.inner.lock().unwrap(); | ^^^^^^ method not found in `std::sys_common::mutex::MutexGuard<'_>` error: aborting due to 2 previous errors Some errors have detailed explanations: E0599, E0616. For more information about an error, try `rustc --explain E0599`.