Tempoprary reverted changes related to Struct.

opal/corelib/struct.rb

@@ -26,13 +26,7 @@ def self.define_struct_attribute(name)
 
     members << name
 
-    define_method name do
-      data[name]
-    end
-
-    define_method "#{name}=" do |value|
-      data[name] = value
-    end
+    attr_accessor name
   end
 
   def self.members
@@ -57,7 +51,7 @@ class << self
 
   def initialize(*args)
     members.each_with_index {|name, index|
-      data[name] = args[index]
+      instance_variable_set "@#{name}", args[index]
     }
   end
 
@@ -81,7 +75,7 @@ def [](name)
       raise TypeError, "no implicit conversion of #{name.class} into Integer"
     end
 
-    data[name]
+    instance_variable_get "@#{name}"
   end
 
   def []=(name, value)
@@ -96,7 +90,7 @@ def []=(name, value)
       raise TypeError, "no implicit conversion of #{name.class} into Integer"
     end
 
-    data[name] = value
+    instance_variable_set "@#{name}", value
   end
 
   def each