src/tools/rustfmt/tests/coverage/source/comments.rs

// rustfmt-emit_mode: coverage
/// Here's a doc comment!
fn main() {
    // foo is bar
    let foo = "bar";
    // loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong comment!!!!!
}