= note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>
= help: consider adding a `where Self: std::marker::Sized` bound
= note: all local variables must have a statically known size
+ = help: unsized locals are gated as an unstable feature
error: aborting due to previous error