Function mdbook::utils::take_rustdoc_include_anchored_lines

pub fn take_rustdoc_include_anchored_lines(s: &str, anchor: &str) -> String

Keep lines between the anchor comments specified as-is. For any lines not between the anchors, include them but use # at the beginning. This will hide the lines from initial display but include them when expanding the code snippet or testing with rustdoc.