fail.go

package main

import "encoding/json"
import "strings"
import "fmt"

type Payload struct {
	User    string
}
func asdf() {
	decoder := json.NewDecoder(strings.NewReader("{\"User\":\"asdf\"}"))
	var p Payload
	err := decoder.Decode(&p)
	fmt.Printf("%s\n", err)
	fmt.Printf("%s\n", p.User)
}
// %!s(<nil>)
// asdf
// http://imgur.com/a/8NqZf