b.Run(strconv.Itoa(depth), func(b *testing.B) {
			b.ReportAllocs()
			var x uintptr
			for i := 0; i < b.N; i++ {
				x = callerPC(depth)
			}
			_ = x
		})
	}
}

func BenchmarkRecord(b *testing.B) {
	const nAttrs = nAttrsInline * 10
	var a Attr

	for i := 0; i < b.N; i++ {
		r := NewRecord(time.Time{}, LevelInfo, "", 0)
		for j := 0; j < nAttrs; j++ {
			r.AddAttrs(Int("k", j))
		}