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This was broken in Rails 4.2.0+ because the `@scope` object is no longer a Hash
but an internal structure that supports a better override/rollback flow for cases
like this. If we would only support Rails 4.2, this method could be something
like this:
```ruby
def with_devise_exclusive_scope(new_path, new_as, options)
overrides = { as: new_as, path: new_path, module: nil }
overrides.merge!(options.slice(:constraints, :defaults, :options))
@scope = @scope.new(overrides)
yield
ensure
@scope = @scope.parent
end
```