error[E0658]: exclusive range pattern syntax is experimental --> $DIR/feature-gate-exclusive-range-pattern.rs:3:9 | LL | 0 .. 3 => {} | ^^^^^^ | = note: for more information, see https://github.com/rust-lang/rust/issues/37854 = help: add #![feature(exclusive_range_pattern)] to the crate attributes to enable error: aborting due to previous error For more information about this error, try `rustc --explain E0658`.