memcached gem and rubinius - wrong constant name swig_runtime_data

[miv]

Not sure if its should be in rubinius or in memcached.

My project using memcached gem (1.0.6) and trying to run it on rubinius 1.2.1 produces (only intresting part):

An exception occurred at_exit handler
    wrong constant name swig_runtime_data (NameError)

Backtrace:
    Module(Class)#normalize_const_name at kernel/common/module.rb:711
     Module(Class)#recursive_const_get at kernel/common/module.rb:678
               Module(Class)#const_get at kernel/common/module.rb:535
  { } in ActiveSupport::CoreExtensions::Module(Class)#local_constants at \
          /usr/local/rubinius/1.2.1/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/module/introspection.rb:70
                            Array#each at kernel/bootstrap/array.rb:71
  { } in ActiveSupport::CoreExtensions::Module(Class)#local_constants at \
          /usr/local/rubinius/1.2.1/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/module/introspection.rb:70
                            Array#each at kernel/bootstrap/array.rb:71
  ActiveSupport::CoreExtensions::Module(Class)#local_constants at \
          /usr/local/rubinius/1.2.1/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/module/introspection.rb:68
  ActiveSupport::CoreExtensions::Module(Class)#local_constant_names at \
          /usr/local/rubinius/1.2.1/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/module/introspection.rb:86
  { } in ActiveSupport::Dependencies(Module)#new_constants_in at \
          /usr/local/rubinius/1.2.1/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:504
                      { } in Array#map at kernel/bootstrap/array.rb:90
                            Array#each at kernel/bootstrap/array.rb:71
                   Array#collect (map) at kernel/bootstrap/array.rb:90
 ActiveSupport::Dependencies(Module)#new_constants_in at /usr/local/rubinius
                                                         /1.2.1/gems/1.8/gems
                                                         /activesupport-2.3.5
                                                         /lib/active_support
                                                         /dependencies.rb:495
 ActiveSupport::Dependencies(Module)#load_file at /usr/local/rubinius/1.2.1/gems
                                                  /1.8/gems/activesupport-2.3.5
                                                  /lib/active_support
                                                  /dependencies.rb:379
 ActiveSupport::Dependencies(Module)#require_or_load at /usr/local/rubinius
                                                        /1.2.1/gems/1.8/gems
                                                        /activesupport-2.3.5/lib
                                                        /active_support
                                                        /dependencies.rb:259
 ActiveSupport::Dependencies(Module)#depend_on at /usr/local/rubinius/1.2.1/gems
                                                  /1.8/gems/activesupport-2.3.5
                                                  /lib/active_support
                                                  /dependencies.rb:224
  ActiveSupport::Dependencies::Loadable(Object)#require_dependency at \
          /usr/local/rubinius/1.2.1/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:136
                       main.__script__ at app/models/stage_item.rb:688
          Rubinius::CodeLoader.require at kernel/common/codeloader.rb:145
  Kernel(Object)#gem_original_require (require) at kernel/common/kernel.rb:739
               Kernel(Object)#require at /usr/local/rubinius/1.2.1/lib/rubygems
                                         /custom_require.rb:31
  { } in ActiveSupport::Dependencies::Loadable(Object)#require at \
          /usr/local/rubinius/1.2.1/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156
 ActiveSupport::Dependencies(Module)#new_constants_in at /usr/local/rubinius
                                                         /1.2.1/gems/1.8/gems
                                                         /activesupport-2.3.5
                                                         /lib/active_support
                                                         /dependencies.rb:521
 ActiveSupport::Dependencies::Loadable(Object)#require at /usr/local/rubinius
                                                          /1.2.1/gems/1.8/gems
                                                          /activesupport-2.3.5
                                                          /lib/active_support
                                                          /dependencies.rb:156
                { } in main.__script__ at config/environment.rb:94
                            Array#each at kernel/bootstrap/array.rb:71
                       main.__script__ at config/environment.rb:94
          Rubinius::CodeLoader.require at kernel/common/codeloader.rb:145
  Kernel(Object)#gem_original_require (require) at kernel/common/kernel.rb:739
               Kernel(Object)#require at /usr/local/rubinius/1.2.1/lib/rubygems
                                         /custom_require.rb:31

Which leads to activesupport's introspection.rb where we can see:

  if RUBY_VERSION < '1.9'
    # Returns the constants that have been defined locally by this object and
    # not in an ancestor. This method is exact if running under Ruby 1.9. In
    # previous versions it may miss some constants if their definition in some
    # ancestor is identical to their definition in the receiver.
    def local_constants
      inherited = {}

      ancestors.each do |anc|
        next if anc == self
        anc.constants.each { |const| inherited[const] = anc.const_get(const) }
      end

      constants.select do |const|
        !inherited.key?(const) || inherited[const].object_id != const_get(const).object_id
      end
    end
  else
    def local_constants #:nodoc:
      constants(false)
    end
  end

So when i replaced all this code with this, everything start to work fine:

def local_constants #:nodoc:
  constants()
end

[brixen]

See https://github.com/fauna/memcached/issues/37

[evanphx]

This is a bug in swig, not in rubinius.