testing.Helper failure in panic case

main_test.go

package main

import "testing"

func Test(t *testing.T) {
	blah(t, func() {})
	blah2(t, func() { panic("oh dear") })
}

func blah(t *testing.T, f func()) {
	t.Helper()

	defer func() {
		t.Helper()

		err := recover()
		if err == nil {
			t.Errorf("expected panic")
		}
	}()
	f()
}

func blah2(t *testing.T, f func()) {
	t.Helper()

	defer func() {
		t.Helper()
		err := recover()
		if _, ok := err.(S); !ok {
			t.Errorf("expected S, got %T", err)
		}
	}()
	f()
}

type S struct{}