gistfile1.txt

### nil check for boolean

```
% cat ./NilCheckForBoolean.swift
import Foundation

func target() {
    for _ in 1...100000 {
        let e: Bool? = true
        if e == nil {  }
    }
}

for i in 1...100 {
    let start = NSDate()
    target()
    let end = NSDate()

    let time = end.timeIntervalSince1970 - start.timeIntervalSince1970
    print("\(time)")
    sleep(1)
}
```

### nil check for enum

```
% cat ./NilCheckForEnum.swift
import Foundation

enum E<T> {
    case A(T)
    case B(T)
}
func target() {
    for _ in 1...100000 {
        let e: E<Int>? = .A(1)
        if e == nil { }
    }
}

for i in 1...100 {
    let start = NSDate()
    target()
    let end = NSDate()

    let time = end.timeIntervalSince1970 - start.timeIntervalSince1970
    print("\(time)")
    sleep(1)
}
```

### result(enum)


### result(boolean)