Are Go struct anonymous fields public or private?

Question content

As we all know, fields starting with capital letters are public fields, and fields starting with non-capital letters are private fields. But golang also supports anonymous fields. For example:

type myType struct {
  string
}

These fields are designed for embedding. But is this field public or private?

Correct answer

If the type name of an embedded type is lowercase, it has package visibility. For example:

type t struct {
    string
}

func main() {
    x := t{}
    x.string = "a"
    fmt.println(x)
}

However, if you move the type t to another package p:

package p

type t struct {
  string
}

package main

import "testmod/p"

func main() {
    x := p.T{}
    x.string = "a" // Error
}

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