Beta miscompiles match when a pattern has a range including signed minimum

[tspiteri]

fn main() {
    let x = match 1i8 {
        -0x80..=-1 => -99,
        0..=10 => 0,
        _ => 99,
    };
    println!("{}", x);
}

This prints -99 instead of 0.

Changing the first pattern to -0x80 | -0x7f..=-1 => -99, will work around the issue.

Changing it to -0x80..=-0x7f | -0x7e..=-1 reintroduces the issue.

[Centril]

cc @varkor -- is this the same as the bug you fixed in #57978?

[memoryruins]

@Centril It is. the example on nightly now prints 0, as well as the -0x80..=-0x7f | -0x7e..=-1 version
rust version 1.34.0-nightly (852701ad6 2019-02-01)

@tspiteri thank you for reporting! the fix was accepted for beta backport and will be on there soon ^^

[tspiteri]

Works in updated nightly, thanks! I didn't find the dup as I looked in open issues only, so I missed #57894 which was closed a couple of hours earlier!