The BitOrAssign trait enables the |= operator for data types that implement it.

Implementing BitOrAssign looks like this:

pub enum BitExample {
 Yes,
 No,
}

impl BitOrAssign for BitExample {
    fn bitor_assign(&mut self, other: BitExample) {
        *self = match (&self, other) {
            (BitExample::Yes, BitExample::Yes) => BitExample::Yes,
            (BitExample::No, BitExample::Yes) => BitExample::Yes,
            (BitExample::Yes, BitExample::No) => BitExample::Yes,
            (BitExample::No, BitExample::No) => BitExample::No,
        };
    }
}