Auto merge of #47678 - kennytm:rollup, r=kennytm

Rollup of 14 pull requests

- Successful merges: #47423, #47425, #47440, #47541, #47549, #47554, #47558, #47610, #47635, #47655, #47661, #47662, #47667, #47672
- Failed merges:

src/librustdoc/html/render.rs

@@ -2423,9 +2423,10 @@ fn item_trait(w: &mut fmt::Formatter, cx: &Context, it: &clean::Item,
     // Output the trait definition
     write!(w, "<pre class='rust trait'>")?;
     render_attributes(w, it)?;
-    write!(w, "{}{}trait {}{}{}",
+    write!(w, "{}{}{}trait {}{}{}",
            VisSpace(&it.visibility),
            UnsafetySpace(t.unsafety),
+           if t.is_auto { "auto " } else { "" },
            it.name.as_ref().unwrap(),
            t.generics,
            bounds)?;