Application will die with syntax error when trying to define hyphenated resources

This resource declaration:

   resources user do 
     resource 'my-nested-resource'
   end

will end up in a syntax error when trying to boot the application:

/usr/lib/ruby/gems/1.8/gems/actionpack-3.0.0.beta/lib/action_dispatch/routing/route_set.rb:151:in `define_hash_access': compile error (SyntaxError)
/usr/lib/ruby/gems/1.8/gems/actionpack-3.0.0.beta/lib/action_dispatch/routing/route_set.rb:149: syntax error, unexpected '-', expecting '\n' or ';'
...ef hash_for_two_oh_user_basic-stats_url(options = nil)      ...
                              ^
/usr/lib/ruby/gems/1.8/gems/actionpack-3.0.0.beta/lib/action_dispatch/routing/route_set.rb:151: syntax error, unexpected kEND, expecting $end
              end                              ...
                 ^

This happens in the generated routing code using module_eval, from actionpack/lib/action_dispatch/routing/route_set.rb

def define_hash_access(route, name, kind, options)
  selector = hash_access_name(name, kind)
  # We use module_eval to avoid leaks
  @module.module_eval <<-END_EVAL, __FILE__, __LINE__ + 1
    def #{selector}(options = nil) # def hash_for_users_url(options = nil)
    options ? #{options.inspect}.merge(options) : #{options.inspect} # options ? {:only_path=>false}.merge(options) :   {:only_path=>false}
end # end
    protected :#{selector} # protected :hash_for_users_url
   END_EVAL

That error can be avoided by using the define_method('method-name') instead of a plain def and would allow for hyphenated resources as well. However I'm not sure if there is a performance reason not do use define_method.