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class Foo
   def self.test; "test"; end
   class << self
      alias test2 test
   end
end

Foo.test  => "test"
Foo.test2 => "test"

static VALUE foo_test(){ return rb_str_new2("test"); }

void Init_foo(){
   VALUE cFoo, sFoo;

   cFoo = rb_define_class("Foo", rb_cObject);
   sFoo = rb_singleton_class(cFoo);

   rb_define_alias(sFoo, "test2", "test");
}