A sample code, to use reflect and convert interface{} to original type.

anytype_sample.go

package main

import (
    "fmt"
    "reflect"
)

type AnyType interface{}

func f(a AnyType) AnyType {
    return a
}

func main() {
    var i32 int32
    i32 = 32
    var i64 int64
    i64 = 64
    str := "String"
    lst := []AnyType{1, "hello!", []AnyType{1,2,3}}

    r1 := f(i32)
    t1 := reflect.TypeOf(r1)
    fmt.Println(r1)
    fmt.Println(t1, t1.Kind() == reflect.Int32, r1.(int32) == i32)

    r2 := f(i64)
    t2 := reflect.TypeOf(r2)
    fmt.Println(r2)
    fmt.Println(t2, t2.Kind() == reflect.Int64, r2.(int64) == i64)

    r3 := f(str)
    t3 := reflect.TypeOf(r3)
    fmt.Println(r3)
    fmt.Println(t3, r3.(string) == str)

    r4 := f(lst)
    t4 := reflect.TypeOf(r4)
    fmt.Println(r4)
    fmt.Println(t4)
}