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#![feature(never_patterns)]
#![allow(incomplete_features)]
enum Void {}
fn main() {}
macro_rules! never {
() => { ! }
}
fn no_arms_or_guards(x: Void) {
match None::<Void> {
Some(!) => {}
//~^ ERROR a never pattern is always unreachable
None => {}
}
match None::<Void> {
Some(!) if true,
//~^ ERROR guard on a never pattern
None => {}
}
match None::<Void> {
Some(!) if true => {}
//~^ ERROR a never pattern is always unreachable
None => {}
}
match None::<Void> {
Some(never!()) => {},
//~^ ERROR a never pattern is always unreachable
None => {}
}
}
|
