This example compiles fine with latest nightly, but cargo fmt fails. The failure also occurs on clippy's CI (https://travis-ci.com/rust-lang/rust-clippy/jobs/274511513).
Probably we need rustup and update submodule on rust-lang/rust?

#![feature(half_open_range_patterns)]
#![feature(exclusive_range_pattern)]

fn main() {
    match 54 {
        5.. => println!("yay!"),
        _ => (),
    }
}

error log:

error: `X..` range patterns are not supported
 --> main.rs:6:9
  |
6 |         5.. => println!("yay!"),
  |         ^^^ help: try using the maximum value for the type: `5..MAX`