error[E0277]: the trait bound `E: From<()>` is not satisfied --> $DIR/never-value-fallback-issue-66757.rs:28:5 | LL | >::from(never); | ^^^^^^^^^^^^^^^^^^^^ the trait `From<()>` is not implemented for `E` | = help: the trait `From` is implemented for `E` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.