Why doesn't Go panic when trying to read a nil map?

Question content

This is the code, I expected a panic when accessing mp["12"] but it fails It works fine there

// You can edit this code!
// Click here and start typing.
package main

import "log"

func main() {
    var mp map[string]int = nil
    log.Println(mp["12"], "12") // works fine
    if mp == nil {
        panic("map is nil") // panic here
    }
}

Correct answer

You can read from a nil map, but not write. The language specification says:

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