mastodon/app/views/admin/users/roles/show.html.haml

- content_for :page_title do
  = t('admin.accounts.change_role.title', username: @user.account.username)

= simple_form_for @user, url: admin_user_role_path(@user) do |f|
  .fields-group
    = f.association :role, wrapper: :with_block_label, collection: UserRole.assignable, label_method: :name, include_blank: I18n.t('admin.accounts.change_role.no_role')

  .actions
    = f.button :button, t('generic.save_changes'), type: :submit