error[E0658]: use of unstable library feature 'i128' (see issue #35118)
  --> $DIR/E0658.rs:12:13
   |
LL |     let _ = ::std::u128::MAX; //~ ERROR E0658
   |             ^^^^^^^^^^^^^^^^
   |
   = help: add #![feature(i128)] to the crate attributes to enable

error: aborting due to previous error

For more information about this error, try `rustc --explain E0658`.