makefunc

q.go

package main

import (
  "runtime"
  "reflect"
  "fmt"
)

type foo struct {}

func main() {
  for i := 0; i < 1024; i++ {
    func() {
      s := &foo{}
      funcType := reflect.TypeOf(func(**foo){})
      // generic code below
      funcImpl := func(args []reflect.Value) (rets []reflect.Value) {
        fmt.Printf("finalized\n")
        return
      }
      runtime.SetFinalizer(&s, reflect.MakeFunc(funcType, funcImpl).Interface())
      runtime.GC()
    }()
  }
}