One-line closure without return type

Question

In Swift, if a closure holds only a single statement, it automatically returns the value returned from that single statement.

This does not feel very natural in all

Answer 1

What about this ... ;)

@discardableResult func StringReturningFunc() -> String {
    return "Test String"
}

// Error: Cannot convert the expressions type '() -> $T0' to type 'String'
let closure: () -> () = {
    StringReturningFunc()
}

Answer 2

The reason this happens is the shorthand for single line expression closures. There is an implicit 'return' in your closure as it is written.

let closure: () -> () = {
    StringReturningFunc()
    return
}

Writing it like that should work