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,