for _, a := range argshlVU {
		arg := a
		testShiftFunc(t, shlVU, arg)
	}

	for _, a := range argshrVU {
		arg := a
		testShiftFunc(t, shrVU, arg)
	}
}

func TestIssue31084(t *testing.T) {
	// compute 10^n via 5^n << n.
	const n = 165
	p := nat(nil).expNN(nat{5}, nat{n}, nil, false)
	p = p.shl(p, n)
	got := string(p.utoa(10))
	want := "1" + strings.Repeat("0", n)