doc: Fix a number of broken links

cc #14515

src/librustdoc/html/format.rs

@@ -278,18 +278,24 @@ fn primitive_link(f: &mut fmt::Formatter,
             needs_termination = true;
         }
         Some(&cnum) => {
+            let path = m.paths.get(&ast::DefId {
+                krate: cnum,
+                node: ast::CRATE_NODE_ID,
+            });
             let loc = match *m.extern_locations.get(&cnum) {
                 render::Remote(ref s) => Some(s.to_string()),
                 render::Local => {
                     let loc = current_location_key.get().unwrap();
-                    Some(("../".repeat(loc.len())).to_string())
+                    Some("../".repeat(loc.len()))
                 }
                 render::Unknown => None,
             };
             match loc {
-                Some(s) => {
-                    try!(write!(f, "<a href='{}/primitive.{}.html'>",
-                                s, prim.to_url_str()));
+                Some(root) => {
+                    try!(write!(f, "<a href='{}{}/primitive.{}.html'>",
+                                root,
+                                path.ref0().as_slice().head().unwrap(),
+                                prim.to_url_str()));
                     needs_termination = true;
                 }
                 None => {}

src/librustdoc/html/render.rs

@@ -1380,8 +1380,13 @@ fn item_module(w: &mut fmt::Formatter, cx: &Context,
                         if s.len() == 0 { return Ok(()); }
                         try!(write!(f, "<code> = </code>"));
                         if s.contains("\n") {
-                            write!(f, "<a href='{}'>[definition]</a>",
-                                   item.href())
+                            match item.href() {
+                                Some(url) => {
+                                    write!(f, "<a href='{}'>[definition]</a>",
+                                           url)
+                                }
+                                None => Ok(()),
+                            }
                         } else {
                             write!(f, "<code>{}</code>", s.as_slice())
                         }
@@ -1547,8 +1552,8 @@ fn item_trait(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
     }
     try!(write!(w, "</ul>"));
     try!(write!(w, r#"<script type="text/javascript" async
-                              src="{root_path}/implementors/{path}/\
-                                   {ty}.{name}.js"></script>"#,
+                              src="{root_path}/implementors/{path}/{ty}.{name}.js">
+                      </script>"#,
                 root_path = Vec::from_elem(cx.current.len(), "..").connect("/"),
                 path = if ast_util::is_local(it.def_id) {
                     cx.current.connect("/")