src/test/ui/consts/const-eval/write-to-uninhabited-enum-variant.rs

// run-pass

#![allow(dead_code)]

enum Empty { }
enum Test1 {
    A(u8),
    B(Empty),
}
enum Test2 {
    A(u8),
    B(Empty),
    C,
}

fn bar() -> Option<Empty> {
    None
}

fn main() {
    if let Some(x) = bar() {
        Test1::B(x);
    }

    if let Some(x) = bar() {
        Test2::B(x);
    }
}