Cursed if-statement

An interesting consequence of if statements being usable as expressions, and Rust not requiring brackets around the condition, is you can stack if indefinitely.

if if if a == b {
    b == c
} else {
    a == c
} {
    a == d
} else {
    c == d
} {
    println!("True!");
} else {
    println!("False!");
}

clippy and rustfmt don't catch this, and it's quite possibly the most cursed thing I've ever seen written in safe Rust.