[go-nuts] callee returns nil, caller does not see nil

[Kevin Manley]

I am new to Go so I'm sure this is just me misunderstanding how things 
work, but I was surprised at this result. Please can someone help me 
understand why the return value from Validate() is not seen as nil by the 
caller, despite Validate() returning nil? 
TIA, Kevin

https://play.golang.org/p/UF4EYwOQ-n

package main

import (
"fmt"
)

type MultiError map[string]error

func (e MultiError) Error() string {
return fmt.Sprintf("%d errors", len(e))
}

func Validate() MultiError {
return nil
}

func main() {
var err error
err = Validate()
if err == nil {
fmt.Println("err is nil, as expected")
} else {
fmt.Println("err is not nil!!: ", err)
}
}




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