error[E0390]: only a single inherent implementation marked with `#[lang = "str"]` is allowed for the `str` primitive --> $DIR/single-primitive-inherent-impl.rs:9:1 | LL | / impl str { LL | | LL | | } | |_^ | = help: consider using a trait error: aborting due to previous error For more information about this error, try `rustc --explain E0390`.