error[E0277]: the size for values of type `[u8]` cannot be known at compilation time --> $DIR/issue-30355.rs:5:8 | LL | &X(*Y) | ^^ doesn't have a size known at compile-time | = help: the trait `Sized` is not implemented for `[u8]` = note: all function arguments must have a statically known size = help: unsized fn params are gated as an unstable feature error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0277`.