rust/tests/ui/pattern/usefulness/issue-12369.rs

#![deny(unreachable_patterns)]

fn main() {
    let sl = vec![1,2,3];
    let v: isize = match &*sl {
        &[] => 0,
        &[a,b,c] => 3,
        &[a, ref rest @ ..] => a,
        &[10,a, ref rest @ ..] => 10 //~ ERROR: unreachable pattern
    };
}
Make is_useful handle empty types properly 2016-11-29 15:10:26 +08:00			`#![deny(unreachable_patterns)]`
Feature gate all slice patterns. #23121 Until some backwards-compatibility hazards are fixed in #23121, these need to be unstable. [breaking-change] 2015-03-26 18:34:27 -07:00
rustc: Avoid an unwrap() in check_match Closes #12369 2014-05-20 21:42:30 -07:00			`fn main() {`
			`let sl = vec![1,2,3];`
cleanup: replace `as[_mut]_slice()` calls with deref coercions 2015-02-01 21:53:25 -05:00			`let v: isize = match &*sl {`
implement RFC495 semantics for slice patterns non-MIR translation is still not supported for these and will happily ICE. This is a [breaking-change] for many uses of slice_patterns. 2016-03-11 12:54:59 +02:00			`&[] => 0,`
			`&[a,b,c] => 3,`
Use new 'p @ ..' syntax in tests. 2019-07-08 01:47:46 +02:00			`&[a, ref rest @ ..] => a,`
			`&[10,a, ref rest @ ..] => 10 //~ ERROR: unreachable pattern`
rustc: Avoid an unwrap() in check_match Closes #12369 2014-05-20 21:42:30 -07:00			`};`
			`}`