Feature request - guard from Swift

[fatjoe79]

See this topic.

Support Guard Control like swift

sometimes we have define the option type such as “var a: ClassA? = null” ,and then i need check a : val realA = a?:return if(realA.somePr == true){ //do .... } //.... .but i want to use it like swift : **guard** let realA = a else { return } if(realA.somePr == true){ //do .... } //.... how to impl it? as i know swift : guard let unwrappedString = wrappedString ,let bunwrappedString = bwrappedString where .....else { return } // unwrappedString can be accessed outside guard block k…