error[E0584]: found a documentation comment that doesn't document anything --> $DIR/doc-before-extern-rbrace.rs:4:5 | LL | /// hi | ^^^^^^ this doc comment doesn't document anything | = help: doc comments must come before what they document, if a comment was intended use `//` error: aborting due to previous error For more information about this error, try `rustc --explain E0584`.