Comment 1:

Ugh.

Comment 2:

I considered option 2, but I'm not sure it's a viable solution,
as %v will currently produce moderately useful output
when presented with a reflect.Value, because reflect.Value
implements String. People are probably relying on that.
Ugh, agreed. FWIW I would not have agreed to include this hack
in production code, but it's very useful in tests. On reflection,
I should probably clone/reimplement that part of fmt, but the above
RawValue fix would be preferable.

I don't understand the issue. This program prints 3.

package main

import (
"fmt"
"reflect"
)

type t struct { a int }

func main() {
var x = t{3}
fmt.Println(reflect.ValueOf(x.a).Interface())
}

This shows the problem:

package main

import (
"fmt"
"reflect"
)

type t struct{ a int }

func main() {
var x = t{3}
fmt.Println(reflect.ValueOf(x).Field(0).Interface())
}