In Go, can both a type and a pointer to a type implement an interface?

Question

For example in the following example:

type Food interface {
    Eat() bool
}

type vegetable_s struct {
    //some data
}

type Vegetable *vegetable_s

type Salt struct {
    // some data
}

func (p Vegetable) Eat() bool {
    // some code
}

func (p Salt) Eat() bool {
    // some code
}

Do Vegetable and Salt both satisfy Food, even though one is a pointer and the other is directly a struct?

Answer 1

The answer is easy to get by compiling the code:

prog.go:19: invalid receiver type Vegetable (Vegetable is a pointer type)

The error is based on the specs requirement of:

The receiver type must be of the form T or *T where T is a type name. The type denoted by T is called the receiver base type; it must not be a pointer or interface type and it must be declared in the same package as the method.

(Emphasizes mine)

The declaration:

type Vegetable *vegetable_s

declares a pointer type, ie. Vegetable is not eligible as a method receiver.