Created attachment 101170 [details]
Attachment 1 [details]

1. Create a new ERB file with following content:

<%= f.fields_for :events do |ef| %>
<%= ef.text_field :name %>
<% end %>

Then the editor shows 'ef' of the line 2 in bold font and highlights ':name'  incorrectly. See the attachment 1 [details].

2. Edit the file above as following:

<%= f.fields_for :events do |ef| %>
<% if ef.object.new_record? %>
<%= ef.text_field :name %>
<% end %>
<% end %>

Then the editor highlights 'new_record?', but should not. See the attachment 2 [details].

3. Delete the line 2 and 4.

Then the colorization gets into a mess. See the attachment 3 [details].