error: vtable entries for ` as A>`: [ MetadataDropInPlace, MetadataSize, MetadataAlign, Method( as Iterator>::next), Method( as Iterator>::size_hint), Method( as Iterator>::advance_by), Method( as Iterator>::nth), ] --> $DIR/vtable-non-object-safe.rs:8:1 | LL | trait A: Iterator {} | ^^^^^^^^^^^^^^^^^ error: aborting due to previous error