redirect on private struct

views/auth/login.eta

@@ -1,12 +1,13 @@
 <form action="/login" method="POST">
+    <% if (it.next) { %><input type="hidden" name="next" value="<%= it.next %>"><% } %>
     <input name="username" placeholder="username">
     <input name="password" placeholder="password">
     <button type="submit">
         come home
     </button>
     <% if (it.error) { %>
-    <%= error %>
+    <%= it.error %>
     <% } %>
     <br>
-    <div> or you can <a href="/register">move in here</a>.
+    <div> or you can <a href="/register<%= it.next ? '?next=' + encodeURIComponent(it.next) : '' %>">move in here</a>.
 </form>