case 8:
			f, _ := constant.Float64Val(v)
			return math.IsInf(f, 0)
		}
	case t.IsComplex():
		ft := types.FloatForComplex(t)
		return ConstOverflow(constant.Real(v), ft) || ConstOverflow(constant.Imag(v), ft)
	}
	base.Fatalf("ConstOverflow: %v, %v", v, t)
	panic("unreachable")
}

// IsConstNode reports whether n is a Go language constant (as opposed to a
// compile-time constant).
//

			base.Errorf("invalid slice index %v (out of bounds for %d-byte string)", r, len(ir.StringVal(l)))
			return false
		} else if ir.ConstOverflow(x, types.Types[types.TINT]) {
			base.Errorf("invalid slice index %v (index too large)", r)
			return false
		}
	}

	return true
}

func checksliceconst(lo ir.Node, hi ir.Node) bool {

		return -1
	}
	if !n.Type().IsInteger() && n.Type().Kind() != types.TIDEAL {
		return -1
	}

	v := toint(n.Val())
	if v.Kind() != constant.Int || constant.Sign(v) < 0 {
		return -1
	}
	if ir.ConstOverflow(v, types.Types[types.TINT]) {
		return -2
	}
	return ir.IntVal(types.Types[types.TINT], v)
}

// callOrChan reports whether n is a call or channel operation.
func callOrChan(n ir.Node) bool {

	if !n.Len.Type().IsInteger() && n.Type().Kind() != types.TIDEAL {
		base.Errorf("non-integer len argument in OMAKESLICECOPY")
	}

	if ir.IsConst(n.Len, constant.Int) {
		if ir.ConstOverflow(n.Len.Val(), types.Types[types.TINT]) {
			base.Fatalf("len for OMAKESLICECOPY too large")
		}
		if constant.Sign(n.Len.Val()) < 0 {
			base.Fatalf("len for OMAKESLICECOPY must be non-negative")
		}
	}