rust-clippy/tests/ui/match_overlapping_arm.rs

#![warn(clippy::match_overlapping_arm)]
#![allow(clippy::redundant_pattern_matching)]
#![allow(clippy::if_same_then_else, clippy::equatable_if_let, clippy::needless_if)]

fn overlapping() {
    const FOO: u64 = 2;

    match 42 {
        0..=10 => println!("0..=10"),
        //~^ ERROR: some ranges overlap
        0..=11 => println!("0..=11"),
        _ => (),
    }

    match 42 {
        0..=5 => println!("0..=5"),
        //~^ ERROR: some ranges overlap
        6..=7 => println!("6..=7"),
        FOO..=11 => println!("FOO..=11"),
        _ => (),
    }

    match 42 {
        2 => println!("2"),
        0..=5 => println!("0..=5"),
        _ => (),
    }

    match 42 {
        2 => println!("2"),
        0..=2 => println!("0..=2"),
        _ => (),
    }

    match 42 {
        0..=10 => println!("0..=10"),
        11..=50 => println!("11..=50"),
        _ => (),
    }

    match 42 {
        2 => println!("2"),
        0..2 => println!("0..2"),
        _ => (),
    }

    match 42 {
        0..10 => println!("0..10"),
        10..50 => println!("10..50"),
        _ => (),
    }

    match 42 {
        0..11 => println!("0..11"),
        //~^ ERROR: some ranges overlap
        0..=11 => println!("0..=11"),
        _ => (),
    }

    match 42 {
        5..7 => println!("5..7"),
        0..10 => println!("0..10"),
        _ => (),
    }

    match 42 {
        5..10 => println!("5..10"),
        0..=10 => println!("0..=10"),
        _ => (),
    }

    match 42 {
        0..14 => println!("0..14"),
        5..10 => println!("5..10"),
        _ => (),
    }

    match 42 {
        5..14 => println!("5..14"),
        0..=10 => println!("0..=10"),
        //~^ ERROR: some ranges overlap
        _ => (),
    }

    match 42 {
        0..7 => println!("0..7"),
        //~^ ERROR: some ranges overlap
        0..=10 => println!("0..=10"),
        _ => (),
    }

    match 42 {
        3.. => println!("3.."),
        0.. => println!("0.."),
        _ => (),
    }

    match 42 {
        ..=23 => println!("..=23"),
        //~^ ERROR: some ranges overlap
        ..26 => println!("..26"),
        _ => (),
    }

    // Issue #7816 - overlap after included range
    match 42 {
        5..=10 => (),
        0..=20 => (),
        21..=30 => (),
        //~^ ERROR: some ranges overlap
        21..=40 => (),
        _ => (),
    }

    // Issue #7829
    match 0 {
        -1..=1 => (),
        -2..=2 => (),
        _ => (),
    }

    // Only warn about the first if there are multiple overlaps
    match 42u128 {
        0..=0x0000_0000_0000_00ff => (),
        //~^ ERROR: some ranges overlap
        0..=0x0000_0000_0000_ffff => (),
        0..=0x0000_0000_ffff_ffff => (),
        0..=0xffff_ffff_ffff_ffff => (),
        _ => (),
    }

    if let None = Some(42) {
        // nothing
    } else if let None = Some(42) {
        // another nothing :-)
    }
}

fn main() {}