plataformatec/devise — pull request #2143 by luisico (2012-11-13 20:09:18+00:00)
Title: Invalid confirmation token message not shown with simple_form

Hi all,

When using Devise confirmable with simple_form, if a user tries to confirm with an invalid token, no meaninful error message is displayed, just the page to resend the confirmation email.

The problem, as I see it, is that the template for this view does not present the attribute `:confirmation_token`, and therefore `#error_notification` doesn't display the error, although it does output that something went wrong.

This can easily be fixed adding the full error for this attribute with:
```ruby
<%= f.full_error :confirmation_token %>
```
Best,
Luis