error[E0599]: the method `as_display` exists for reference `&NoDisplay`, but its trait bounds were not satisfied --> tests/ui/no-display.rs:7:9 | 4 | struct NoDisplay; | ---------------- doesn't satisfy `NoDisplay: std::fmt::Display` ... 7 | #[error("thread: {thread}")] | ^^^^^^^^^^^^^^^^^^ method cannot be called on `&NoDisplay` due to unsatisfied trait bounds | = note: the following trait bounds were not satisfied: `NoDisplay: std::fmt::Display` which is required by `&NoDisplay: DisplayAsDisplay` note: the trait `std::fmt::Display` must be implemented --> $RUST/core/src/fmt/mod.rs | | pub trait Display { | ^^^^^^^^^^^^^^^^^