Swift "h" must be bound in every pattern error - Switch problems

You may need to write something like this:

switch hour {
case let h? where h >= 17:
    return true
default:
    return false

}

Or, as suggested, using if statement:

if let h = hour, h >= 17 {
    return true
} else {
    return false
}

Or else, simply:

return hour != nil && hour! >= 17

---

The error message is often found in this pattern:

enum MyEnum {
    case patternA(Int)
    case patternB(Int)
    case patternC
}

let me = MyEnum.patternB(30)

switch me {
case .patternA(let h), .patternB(let h), .patternC: //<-
    print("A or B with h, or C")
default:
    print("this may never happen")
}

I tried this when I got the same error:

case .something, .other(let parameter) where parameter != nil:
     doSomething()

I think, Swift 5 can't handle such complicated expressions, so I had to split it:

case .something:
     doSomething()
case .other(let parameter) where parameter != nil:
     doSomething()