change footnote anchor formats to fix spurious rendering differences

src/librustdoc/html/markdown.rs

@@ -371,7 +371,7 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for Footnotes<'a, I> {
             match self.inner.next() {
                 Some(Event::FootnoteReference(ref reference)) => {
                     let entry = self.get_entry(&reference);
-                    let reference = format!("<sup id=\"supref{0}\"><a href=\"#ref{0}\">{0}\
+                    let reference = format!("<sup id=\"fnref{0}\"><a href=\"#fn{0}\">{0}\
                                              </a></sup>",
                                             (*entry).1);
                     return Some(Event::Html(reference.into()));
@@ -394,15 +394,15 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for Footnotes<'a, I> {
                         v.sort_by(|a, b| a.1.cmp(&b.1));
                         let mut ret = String::from("<div class=\"footnotes\"><hr><ol>");
                         for (mut content, id) in v {
-                            write!(ret, "<li id=\"ref{}\">", id).unwrap();
+                            write!(ret, "<li id=\"fn{}\">", id).unwrap();
                             let mut is_paragraph = false;
                             if let Some(&Event::End(Tag::Paragraph)) = content.last() {
                                 content.pop();
                                 is_paragraph = true;
                             }
                             html::push_html(&mut ret, content.into_iter());
                             write!(ret,
-                                   "&nbsp;<a href=\"#supref{}\" rev=\"footnote\">↩</a>",
+                                   "&nbsp;<a href=\"#fnref{}\" rev=\"footnote\">↩</a>",
                                    id).unwrap();
                             if is_paragraph {
                                 ret.push_str("</p>");