Method optimize

include/chaiscript/language/chaiscript_optimizer.hpp:121–136

    struct Block {
      template<typename T>
      auto optimize(eval::AST_Node_Impl_Ptr<T> node) {
        if (node->identifier == AST_Node_Type::Block)
        {
          if (!contains_var_decl_in_scope(*node))
          {
            if (node->children.size() == 1) {
              return std::move(node->children[0]);
            } else {
              return chaiscript::make_unique<eval::AST_Node_Impl<T>, eval::Scopeless_Block_AST_Node<T>>(node->text, node->location, 
                  std::move(node->children));
            }
          }
        }

        return node;
      }
    };

    struct Dead_Code {