error[E0605]: non-primitive cast: `i32` as `&dyn* Debug` --> $DIR/unsize-into-ref-dyn-star.rs:7:13 | LL | let i = 42 as &dyn* Debug; | ^^^^^^^^^^^^^^^^^ an `as` expression can only be used to convert between primitive types or to coerce to a specific trait object error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0605`.