在Go中初始化自定义int类型

In Go it is valid to create a type:

type Num int

but how can one then initialize that type? make(Num, 2) does not seem to work.

Initialize the type as you would initialize the underlying type. In your example, the underlying type is an int. For example,

package main

import (
    "fmt"
)

type Num int

func main() {
    var m Num = 7
    n := Num(42)
    fmt.Println(m, n)
}

Output: 7 42

The built-in function make takes a type T, which must be a slice, map or channel type.