[golang] implicit assignment of unexported field

package models

import (
    "github.com/robfig/revel"
)

type Post struct {
    id    int
    title string
}

package controllers

import (
    "blog/app/models"
    "fmt"
    "github.com/coopernurse/gorp"
    "github.com/robfig/revel"
)

type Application struct {
    *revel.Controller
    Txn *gorp.Transaction
}

func (c Application) Index() revel.Result {
    post := &models.Post{1, "title"}
    fmt.Println(post)
    return c.Render()
}

implicit assignment of unexported field

type Post struct {
    Id    int
    Title string
}