Otherwise Rust 1.53.0 gets confused during `cargo doc` because it thinks we want an actual URL: warning: this URL is not a hyperlink --> src/pretty_printer.rs:331:40 | 331 | /// The title for the input (e.g. "http://example.com/example.txt") | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use an automatic link instead: `<http://example.com/example.txt>` | = note: `#[warn(rustdoc::bare_urls)]` on by default = note: bare URLs are not automatically turned into clickable links It was perhaps also a bit confusing to give an URL as an example in the first place, because according to our own API example `examples/inputs.rs` it is meant to be more a free-text thing.