comptime {
    const x = switch (true) {
        true => false,
        false => true,
        true => false,
    };
    _ = x;
}
comptime {
    const x = switch (true) {
        false => true,
        true => false,
        false => true,
    };
    _ = x;
}

// error
// backend=stage2
// target=native
//
// :5:9: error: duplicate switch value
// :13:9: error: duplicate switch value