gistfile1.txt

# In erb view
<% title('Title text') # as helper %>
<%= content_for :title %>
<% content_for(:subtitle) { 'Subtitle text' } %>
<%= content_for :subtitle %>
<% content_for(:copy) { 'Copy text' } %>
<%= yield :copy %>
# Result
Title text
Subtitle text
Copy text

# In haml view
- title('Title text')
= content_for(:title)
- content_for(:subtitle) { 'Subtitle text' }
= content_for(:subtitle)
- content_for(:copy) { 'Subtitle text' }
= content_for(:copy)
# Result
Title text
# content_for setting is not working outside of helpers...

# content_for?(:subtitle) returns false, so there's something preventing this stuff from being set.