package main

import (
	"fmt"
	"reflect"
)

func add(a, b int) int {
	return a + b
}

func main() {
	fn := func(a, b int) int {
		return a + b
	}
	var i int
	fn1 := func() {
		i++
	}
	fn2 := func() func() {
		return func() {
			println("closure", i)
		}
	}

	fns := []any{add, fn, fn1, fn2}
	for _, fn := range fns {
		v := reflect.ValueOf(fn)
		fmt.Println(v.Type())
		fmt.Println(v.Kind())
		if v.Kind() != reflect.Func {
			panic(fmt.Sprintf("not func: %T", fn))
		}

		t := v.Type()
		fmt.Println(t)
		fmt.Println(t.Kind())
		if t.Kind() != reflect.Func {
			panic(fmt.Sprintf("not func: %T", fn))
		}
	}
}