New contribution form with a problem: `binding.pry` at line 13 fires and all paths are OK; line 14 never executes. Error reported is Failure/Error: render ActionView::Template::Error: No route matches {:controller=>"contributions", :action=>"new"} and points to the start of the `simple_form_for` block. Ideas?

new.html.haml

%h1 New contribution

= simple_form_for(new_article_contribution_path(@contribution.article)) do |f|
  = f.error_notification

  .form-inputs

  .form-actions
    = f.button :submit

  - it_matches = new_article_contribution_path(@contribution.article) == "/articles/1/contributions/new"
  - it_matches2 = article_contributions_path(@contribution.article) == '/articles/1/contributions'
  - binding.pry
- binding.pry
= link_to 'Back', article_contributions_path(@contribution.article)