warning: the feature `specialization` is incomplete and may not be safe to use and/or cause compiler crashes --> $DIR/E0520.rs:1:12 | LL | #![feature(specialization)] | ^^^^^^^^^^^^^^ | = note: see issue #31844 <https://github.com/rust-lang/rust/issues/31844> for more information = help: consider using `min_specialization` instead, which is more stable and complete = note: `#[warn(incomplete_features)]` on by default error[E0520]: `fly` specializes an item from a parent `impl`, but that item is not marked `default` --> $DIR/E0520.rs:17:5 | LL | impl<T: Clone> SpaceLlama for T { | ------------------------------- parent `impl` is here ... LL | default fn fly(&self) {} | ^^^^^^^^^^^^^^^^^^^^^ cannot specialize default item `fly` | = note: to specialize, `fly` in the parent `impl` must be marked `default` error: aborting due to previous error; 1 warning emitted For more information about this error, try `rustc --explain E0520`.