如何抑制编译器警告

Question

this code:

guard let isNotNil = anOptional
        else {
            #if DEBUG
                fatalError()
            #endif
            return false
    }

gives a compiler warning when in debug mode on return false :

Will never been executed

Which is right but by intention.

How can I suppress this warning?

Answer 1

With an else statement:

guard let isNotNil = anOptional
        else {
            #if DEBUG
                fatalError()
            #else
                return false
            #endif

}

You can also go to the project or the target build settings and disable the warning for unreachable code.