Test code error about sessions HOT 2 OPEN

sorry for this post
i tried the code
package main

import (
    "fmt"
)

func main() {
    var a interface{}
    a = "haha"
    fmt.Println(a=="haha")
}

it works ok,but how can a interface{} equals to a string?

from sessions.

http://golang.org/ref/spec#Comparison_operators

In any comparison, the first operand must be assignable to the type of the second operand, or vice versa.

A value x of non-interface type X and a value t of interface type T are comparable when values of
type X are comparable and X implements T. They are equal if t's dynamic type is identical to X and t's > dynamic value is equal to x.

http://golang.org/ref/spec#Types

Variables of interface type also have a distinct dynamic type, which is the actual type of the value
stored in the variable at run time.

from sessions.