merge: Workaround rust nightly borrowcheck error from https://github.com/rust-lang/mdBook/pull/1861/files

Author: lovettchris

src/renderer/html_handlebars/helpers/navigation.rs

@@ -149,8 +149,8 @@ fn render(
     _h.template()
         .ok_or_else(|| RenderError::new("Error with the handlebars template"))
         .and_then(|t| {
-            let mut local_rc = rc.clone();
             let local_ctx = Context::wraps(&context)?;
+            let mut local_rc = rc.clone();
             t.render(r, &local_ctx, &mut local_rc, out)
         })?;