public static Stella_Object walkedExpressionExpression(Stella_Object tree) {
    if (Stella_Object.safePrimaryType(tree) == Stella.SGT_STELLA_CONS) {
      { Cons tree000 = ((Cons)(tree));

        { GeneralizedSymbol testValue000 = ((GeneralizedSymbol)(tree000.value));

          if ((testValue000 == Stella.SYM_STELLA_VOID_SYS) ||
              (testValue000 == Stella.SYM_STELLA_TYPED_SYS)) {
            return (tree000.rest.value);
          }
          else {
          }
        }
      }
    }
    else {
    }
    return (tree);
  }