error[E0277]: the trait bound `Struct: Trait` is not satisfied --> $DIR/coercion-generic-bad.rs:16:36 | LL | let s: Box> = Box::new(Struct { person: "Fred" }); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Trait` is not implemented for `Struct` | = help: the trait `Trait<&'static str>` is implemented for `Struct` = note: required for the cast from `Box` to `Box>` error: aborting due to previous error For more information about this error, try `rustc --explain E0277`.