How do I change x in local function from outside?

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Why would you want to do that? Breaking scope seems like a horrible idea.

First of all you're not even using correct syntax
Second of all if you're declaring it at the class level you don't need to deal with pointers

package main

import (
    "fmt"
)

var x int

func local() {
    x = 4
    fmt.Println(x)
}

func main() {
    local()
}

And if you want pointers

package main

import (
    "fmt"
)

func local(x *int) {
    *x = 4
    fmt.Println(*x)
}

func main() {
    x := 0
    local(&x)
}

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>>61773668

>>61773707
Fuckin hell man. I will never be a programmer.