[go-nuts] Error type casting is something strange.

[bbugguj]

Hi.

This is very simple program for testing about error type.
I found that error type casting is something strange.
I thing `err2` should be nil, but it is not nil.
Someone can explain about this result?

https://play.golang.org/p/icjhpCCNe_

----------

package main

import (
"fmt"
)

type MyError struct{}

func (e MyError) Error() string {
return "MyError"
}

func main() {
var myError *MyError = nil
if myError == nil {
fmt.Println("myError is nil")
} else {
fmt.Println("myError is not nil")
}

var err1 error = error(nil)
if err1 == nil {
fmt.Println("err1 is nil")
} else {
fmt.Println("err1 is not nil")
}

var err2 error = error(myError)
if err2 == nil {
fmt.Println("err2 is nil")
} else {
fmt.Println("err2 is not nil")
}

}

-----------
[RESULT]

myError is nil
err1 is nil
err2 is not nil


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