error[E0658]: `X..` patterns in slices are experimental
  --> $DIR/feature-gate-half-open-range-patterns-in-slices.rs:5:10
   |
LL |     let [a @ 3.., b @ ..3, c @ 4..6, ..] = xs;
   |          ^^^^^^^
   |
   = note: see issue #67264 <https://github.com/rust-lang/rust/issues/67264> for more information
   = help: add `#![feature(half_open_range_patterns_in_slices)]` to the crate attributes to enable

error: aborting due to previous error

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