error[E0277]: the size for values of type `[u8]` cannot be known at compilation time --> $DIR/path-by-value.rs:3:6 | LL | fn f(p: Path) { } | ^ borrow the `Path` instead | = help: within `std::path::Path`, the trait `std::marker::Sized` is not implemented for `[u8]` = note: to learn more, visit = note: required because it appears within the type `std::path::Path` = 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 For more information about this error, try `rustc --explain E0277`.