ERB in line comments break template rendering e.g. <% # comment %>

[huoxito]

I was investigating some failures in spree_i18n build and tracked it down to deface overrides. For some reason every time we try to override something in a template, which has erb inline comments, with deface the rendering process breaks.

To reproduce you can place a partial like this in a fresh Spree 2.1 app:

app/views/spree/shared/_nav_bar.html.erb (this is overridden in spree_auth_devise)

<nav id="top-nav-bar" class="columns ten">
  <ul id="nav-bar" class="inline" data-hook>
    <li id="search-bar" data-hook>
      <% # comment %>
      <%= render :partial => 'spree/shared/search' %>
    </li>
  </ul>
</nav>

You should get a very confusing SyntaxError. The same code doesn't generate any error in Spree 2.0.x (which runs Rails 3.2.x). I'm on ruby 2.0.0. Applying the comment like this however <%# comment %> doesn't error.

Curious to know if you guys have any clue on what's happening here?

[sbounmy]

same here, override failling for https://github.com/spree/spree/blob/master/backend/app/views/spree/admin/taxons/edit.html.erb

[rounders]

I encounter this same issue in 1-3-stable which uses deface 1.0.0 when I try to use deface to make a change to spree/admin/payment_methods/_form.html.erb because that view has an inline comment.

additional info:
i'm using Rails 3.2.14, and ruby 1.9.3p393