Errors in ActiveSupport testsuite on 1.9.2-head

Upgrading to i18n 0.4.1 fixed 9 errors.

However the stack too deep errors still remain. I suspect these are related to test/unit. The error is thrown by the assert methods. Version of Ruby => ruby 1.9.2dev (2010-06-06 revision 28184) [x86_64-linux]

That commit fixes 9 errors. 35 errors still remain and I think these are caused by test/unit. The error is thrown by the assert methods.

Version of Ruby: ruby 1.9.2dev (2010-06-06 revision 28184)

Pastie of errors => http://pastie.org/994401

Seemingly fixed by http://github.com/rails/rails/commit/0042f4166f783085eb909d69d542b5..., but that is a bit of a hack.

The problem is, imho, caused because of the way compar.c calls the spaceship:

static VALUE
cmp_eq(VALUE *a)
{
    VALUE c = rb_funcall(a[0], cmp, 1, a[1]);
    ...

ruby-1.9.2-head >
  BrokenComparable = Module.new { def ==(other) self <=> other end }
  BrokenClass = Class.new { include BrokenComparable }
  BrokenClass.new == nil
SystemStackError: stack level too deep

The current implementation of the spaceship operator ...

static VALUE
rb_mod_cmp(VALUE mod, VALUE arg)
{
    *snip*
    cmp = rb_class_inherited_p(mod, arg);
    ...

... tries to lookup the method in the parent classes but fails because it's actually implemented in the Kernel module:

ruby-1.9.2-head > Object.instance_methods(false)
 => [] 
ruby-1.9.2-head > Object.superclass.instance_methods(false)
 => [:==, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__] 
ruby-1.9.2-head > Object.superclass.superclass.methods(false)
 => [] 
ruby-1.9.2-head > Object.superclass.superclass.class.instance_methods(false)
 => [:to_i, :to_f, :to_s, :to_a, :inspect, :&, :|, :^, :nil?, :to_r, :rationalize, :to_c] 
ruby-1.9.2-head > Object.superclass.superclass.class.superclass.instance_methods(false)
 => [] 
ruby-1.9.2-head > Object.superclass.superclass.class.superclass.superclass.instance_methods(false)
 => [:==, :equal?, :!, :!=, :instance_eval, :instance_exec, :__send__] 
...

ruby-1.9.2-head > Kernel.instance_methods(false)
 => [:nil?, :===, :=~, :!~, :eql?, :hash, :<=>, :class, :singleton_class, :clone, :dup, :initialize_dup, :initialize_clone, :taint, :tainted?, :untaint, :untrust, :untrusted?, :trust, :freeze, :frozen?, :to_s, :inspect, :methods, :singleton_methods, :protected_methods, :private_methods, :public_methods, :instance_variables, :instance_variable_get, :instance_variable_set, :instance_variable_defined?, :instance_of?, :kind_of?, :is_a?, :tap, :send, :public_send, :respond_to?, :respond_to_missing?, :extend, :display, :method, :public_method, :define_singleton_method, :__id__, :object_id, :to_enum, :enum_for]

But I'm neither familiar with C nor the ruby source so this is just a guess.

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