error[E0038]: the trait `NotObjectSafe` cannot be made into an object --> $DIR/coherence-impl-trait-for-trait-object-safe.rs:7:24 | LL | impl NotObjectSafe for dyn NotObjectSafe { } | ^^^^^^^^^^^^^^^^^ `NotObjectSafe` cannot be made into an object | note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit --> $DIR/coherence-impl-trait-for-trait-object-safe.rs:6:43 | LL | trait NotObjectSafe { fn eq(&self, other: Self); } | ------------- ^^^^ ...because method `eq` references the `Self` type in this parameter | | | this trait cannot be made into an object... = help: consider moving `eq` to another trait error[E0046]: not all trait items implemented, missing: `eq` --> $DIR/coherence-impl-trait-for-trait-object-safe.rs:7:1 | LL | trait NotObjectSafe { fn eq(&self, other: Self); } | -------------------------- `eq` from trait LL | impl NotObjectSafe for dyn NotObjectSafe { } | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `eq` in implementation error: aborting due to 2 previous errors Some errors have detailed explanations: E0038, E0046. For more information about an error, try `rustc --explain E0038`.