1 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
2 --> $DIR/wf-impl-self-type.rs:5:14
4 LL | impl Foo for Option<[u8]> {}
5 | ^^^^^^^^^^^^ doesn't have a size known at compile-time
7 = help: the trait `Sized` is not implemented for `[u8]`
8 note: required by a bound in `Option`
9 --> $SRC_DIR/core/src/option.rs:LL:COL
11 error: aborting due to previous error
13 For more information about this error, try `rustc --explain E0277`.