unwrapping multiple optionals in if statement

Question

I want to unwrap two optionals in one if statement, but the compiler complaints about an expected expression after operator at the password constant. What could be the reaso

Answer 1

The usage

if let x = y {
}

is not equivalent to

if (let x = y) { // this is actually not allowed
}

"if let" is effectively a two-word keyword, which is equivalent to

if y != nil {
    let x = y!
    // rest of if let block
}