error[E0308]: mismatched types --> $DIR/estr-subtyping.rs:10:15 | LL | wants_uniq(x); | ^ | | | expected struct `std::string::String`, found &str | help: try using a conversion method: `x.to_string()` | = note: expected type `std::string::String` found type `&str` error: aborting due to previous error For more information about this error, try `rustc --explain E0308`.