[go-nuts] go-vet "struct literal uses untagged fields" ... for an array literal.

Now, first a case where go vet shouldn't and also doesn't complain:

func test() {
type glVec4 [4]gl.Float
foo := glVec4{0, 0, 0, 1}
println(fmtStr("%v", foo))
}

The imported gl.Float is just aliasing float32.

But with the following, go vet yields "struct literal uses untagged fields":

foo := ugl.GlVec4{0, 0, 0, 1}

Only difference? Now the [4]gl.Float type-alias is imported from another
external package. Yet it's the same [4]gl.Float -- an array type, not a
struct type.

The message goes away when I change it to this:

foo := ugl.GlVec4{0: 0, 1: 0, 2: 0, 3: 1}

But this is hardly a good array literal...

Is that a bug or am I missing something?