rust/tests/ui/rfcs/rfc-0000-never_patterns/ICE-119271-never-arm-attr-in-guard.rs

fn main() {}

fn attr_in_guard() {
    match None::<u32> {
        Some(!) //~ ERROR `!` patterns are experimental
        //~^ ERROR: mismatched types
            if #[deny(unused_mut)] //~ ERROR attributes on expressions are experimental
            false //~ ERROR a guard on a never pattern will never be run
    }
    match false {} //~ ERROR: `bool` is non-empty
}