half_open_range_patterns

The tracking issue for this feature is: #67264 It is part of the #![exclusive_range_pattern] feature, tracked at #37854.

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The half_open_range_patterns feature allows RangeTo patterns (..10) to be used in appropriate pattern matching contexts. This requires also enabling the exclusive_range_pattern feature.

It also enabled RangeFrom patterns but that has since been stabilized.

#![feature(half_open_range_patterns)]
#![feature(exclusive_range_pattern)]
    let x = 5;
    match x {
        ..0 => println!("negative!"), // "RangeTo" pattern. Unstable.
        0 => println!("zero!"),
        1.. => println!("positive!"), // "RangeFrom" pattern. Stable.
    }