Is Go struct anonymous field public or private? [duplicate]

Question

As we know, fields start with capital letters are public, and those are not are private. But Golang also support anonymous field. For example:

type myType struct {
  string
}

These fields are design for Embedding. But is this field public or private?

Answer 1

From the specification on struct types:

A field declared with a type but no explicit field name is called an embedded field. An embedded field must be specified as a type name T or as a pointer to a non-interface type name *T, and T itself may not be a pointer type. The unqualified type name acts as the field name.

The unqualified name of string is string.

From the specification on exported identifiers:

An identifier may be exported to permit access to it from another package. An identifier is exported if both:

1. the first character of the identifier's name is a Unicode uppercase letter (Unicode character category Lu); and
2. the identifier is declared in the package block or it is a field name or method name.

The first character of string is not a Unicode uppercase letter.

It follows that the embedded field is not exported. In other words, it's private to the package.