error[E0046]: not all trait items implemented, missing: `Error`, `try_from` --> $DIR/issue-74047.rs:14:1 | LL | impl TryFrom for MyStream {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Error`, `try_from` in implementation | = help: implement the missing item: `type Error = /* Type */;` = help: implement the missing item: `fn try_from(_: OtherStream) -> Result>::Error> { todo!() }` error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0046`.