ldr := ctxt.loader

	/* predefine strings we need for section headers */

	addshstr := func(s string) int {
		off := len(elfshstrdat)
		elfshstrdat = append(elfshstrdat, s...)
		elfshstrdat = append(elfshstrdat, 0)
		return off
	}

	shstrtabAddstring := func(s string) {
		off := addshstr(s)
		elfsetstring(ctxt, 0, s, int(off))
	}

	shstrtabAddstring("")

		if len(test.exp) == 1 {
			addr, err := ParseAddress(test.addrsStr)
			if err != nil {
				t.Errorf("Failed parsing (single) %q: %v", test.addrsStr, err)
				continue
			}
			if !reflect.DeepEqual([]*Address{addr}, test.exp) {
				t.Errorf("Parse (single) of %q: got %+v, want %+v", test.addrsStr, addr, test.exp)
			}
		}

		addrs, err := ParseAddressList(test.addrsStr)
		if err != nil {

			x := x.(*ir.ConvExpr)
			if x.X.Op() == ir.OLITERAL {
				if x, ok := truncate(x.X, x.Type()); ok {
					return x
				}
				valid = false
				return x
			}
		case ir.OADDSTR:
			return addStr(x.(*ir.AddStringExpr))
		}
		return x
	}
	n = edit(n)
	return n, valid
}

// truncate returns the result of force converting c to type t,

	logf := func(format string, args ...any) {
		mu.Lock()
		defer mu.Unlock()
		fmt.Fprintf(&buf, format, args...)
		buf.WriteByte('\n')
	}

	addrStr := cst.ts.Listener.Addr().String()
	ip, port, err := net.SplitHostPort(addrStr)
	if err != nil {
		t.Fatal(err)
	}

	// Install a fake DNS server.