error[E0046]: not all trait items implemented, missing one of: `eq`, `neq` --> $DIR/rustc_must_implement_one_of.rs:41:1 | LL | impl Equal for T3 {} | ^^^^^^^^^^^^^^^^^ missing one of `eq`, `neq` in implementation | note: required because of this annotation --> $DIR/rustc_must_implement_one_of.rs:3:1 | LL | #[rustc_must_implement_one_of(eq, neq)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0046`.