https://play.golang.org/p/WMC4t5oiRR-

package main

import (
	"fmt"
	"reflect"
)

var x = struct{ a, _, c int }{1, 2, 3}

func main() {
	var y = struct{ a, _, c int }{1, 2, 3}
	fmt.Println(x)
	fmt.Println(y)
	fmt.Println(reflect.ValueOf(x).Field(1).Int())
	fmt.Println(reflect.ValueOf(y).Field(1).Int())
	fmt.Println(x == y)
}

Currently (Go 1.12, master) says:

{1 2 3}
{1 0 3}
2
0
true

The x == y part returning true is defined by the spec, but x and y getting a different value for the blank identifier is... weird. I see nothing in the spec that addresses this directly but if squint I might be able to connect some different parts and make guesses as to intent.

But Go 1.4 - Go 1.8 fail to compile with:

./x.go:11: cannot refer to blank field or method

Go 1.9 is the first version where the program above compiles and returns that result.

/cc @ianlancetaylor @griesemer @josharian @cherrymui @randall77 @davecheney