{"ast_node_type":"function","tokens":[{"end":98,"kind":"keyword","start":0,"text":"sm.new_source_file(PathBuf::from(\"foo.rs\").into(),"}]}
    sm.new_source_file(PathBuf::from("foo.rs").into(), r#"#[doc = "`"] fn foo() {}"#.to_string());
    let sm = SourceMap::new(FilePathMapping::empty());
    let (span, _) = source_span_for_markdown_range_inner(