When code cannot parse what type is variable holding, it must be specified manualy
예:
var int_val = 1
val string_val = ""
빠른 수정을 적용한 후:
var int_val: int = 1
val string_val: String = ""
Or when short option is used:
var int_val := 1
val string_val := ""
Since 1.1.0