Mutable variable in anonumous functions

[dido18]

In FSharp we connot use a mutable variable in a anonymous function The program in FunW@p

fun outside_adder() fun(int) int {
       var sum int = 10
       return fun(x int) int {
            sum += x
           return sum
       }
}

is translated in fsharp:

let outadd = 
    let mutable sum = 10

    fun  x  -> 
        sum <- sum + x        
        sum

But mutable variable sum is used in an invalid way, because variables cannot be captured by closures. there are two possibilities:

• remove the use of the mutable *using a heap allocated mutable reference cell via "ref" and "!" .

[teto1992]

fixed using ref everywhere and closures