// variables must be read at least once
// golangci-lint will warn but the compiler will allow it

// package level vars do not need to be read (another reason not to use them)

// constants do not need to be read, if they are not used they are excluded from the build

package main

import "fmt"

func main() {
	x := 10
	x = 20

	fmt.Println(x)
	x = 30
}