warning: the feature `repr128` is incomplete and may not be safe to use and/or cause compiler crashes
  --> $DIR/discriminant_size.rs:2:29
   |
LL | #![feature(core_intrinsics, repr128)]
   |                             ^^^^^^^
   |
   = note: see issue #56071 <https://github.com/rust-lang/rust/issues/56071> for more information
   = note: `#[warn(incomplete_features)]` on by default

warning: 1 warning emitted