auto write = dyn_cast<TF::AssignVariableOp>(user);
      if (!read && !write) {
        unsupported_use = true;
        break;
      }

      if (read && !info.is_read) {
        info.is_read = true;
        info.RefineType(read.getValue().getType());
        info.read_attrs = user->getAttrDictionary();
      }

      if (write) {
        info.is_written = true;

	'b': &Qualified{Scope: &Name{Name: "std"}, Name: &Name{Name: "basic_string"}},
	's': &Qualified{Scope: &Name{Name: "std"}, Name: &Name{Name: "string"}},
	'i': &Qualified{Scope: &Name{Name: "std"}, Name: &Name{Name: "istream"}},
	'o': &Qualified{Scope: &Name{Name: "std"}, Name: &Name{Name: "ostream"}},
	'd': &Qualified{Scope: &Name{Name: "std"}, Name: &Name{Name: "iostream"}},
}