if err := Fprint(&buf, fset, ret); err != nil {
		t.Fatal(err)
	}
	want := "return call()"
	if got := buf.String(); got != want {
		t.Fatalf("got %q, want %q", got, want)
	}
}

func TestSourcePosNewline(t *testing.T) {
	// We don't provide a syntax for escaping or unescaping characters in line
	// directives (see https://go.dev/issue/24183#issuecomment-372449628).