package main

import "fmt"

type Vertex struct {
    X, Y int
}

var (
    v1 = Vertex{1, 2}   // has type Vertex
    v2 = Vertex{X: 1}   // Y:0 is implicit
    v3 = Vertex{}       // X:0 and Y:0
    p  = &Vertex{1, 2}  // has type *Vertex
)

func main() {
    fmt.Println(v1, p, v2, v3)
}