n.SetType(nil)
		return n
	}

	if kind == types.TSTRING {
		t = types.ByteType
	} else {
		t = t.Elem()
	}
	n.SetType(types.NewPtr(t))
	return n
}

// tcRecv typechecks an ORECV node.
func tcRecv(n *ir.UnaryExpr) ir.Node {
	n.X = Expr(n.X)
	n.X = DefaultLit(n.X, nil)
	l := n.X
	t := l.Type()
	if t == nil {
		n.SetType(nil)
		return n
	}
	if !t.IsChan() {

	case ir.ODOTTYPE:
		n := n.(*ir.TypeAssertExpr)
		return tcDotType(n)

	case ir.OINDEX:
		n := n.(*ir.IndexExpr)
		return tcIndex(n)

	case ir.ORECV:
		n := n.(*ir.UnaryExpr)
		return tcRecv(n)

	case ir.OSEND:
		n := n.(*ir.SendStmt)
		return tcSend(n)

	case ir.OSLICEHEADER:
		n := n.(*ir.SliceHeaderExpr)
		return tcSliceHeader(n)

	case ir.OSTRINGHEADER:

	}
}

var (
	fakeLines     []int
	fakeLinesOnce sync.Once
)

func chanDir(d int) types.ChanDir {
	// tag values must match the constants in cmd/compile/internal/gc/go.go
	switch d {
	case 1 /* Crecv */ :
		return types.RecvOnly
	case 2 /* Csend */ :
		return types.SendOnly
	case 3 /* Cboth */ :
		return types.SendRecv
	default:
		errorf("unexpected channel dir %d", d)
		return 0
	}
}

	case TCHAN:
		switch t.ChanDir() {
		case Crecv:
			b.WriteString("<-chan ")
			tconv2(b, t.Elem(), 0, mode, visited)
		case Csend:
			b.WriteString("chan<- ")
			tconv2(b, t.Elem(), 0, mode, visited)
		default:
			b.WriteString("chan ")
			if t.Elem() != nil && t.Elem().IsChan() && t.Elem().Sym() == nil && t.Elem().ChanDir() == Crecv {
				b.WriteByte('(')
				tconv2(b, t.Elem(), 0, mode, visited)

	case *ast.ChanType:
		dir := "types.Cboth"
		switch t.Dir {
		case ast.SEND:
			dir = "types.Csend"
		case ast.RECV:
			dir = "types.Crecv"
		}
		return fmt.Sprintf("types.NewChan(%s, %s)", i.subtype(t.Value), dir)
	case *ast.FuncType:
		return fmt.Sprintf("newSig(%s, %s)", i.fields(t.Params, false), i.fields(t.Results, false))
	case *ast.InterfaceType:

type ChanDir uint8

func (c ChanDir) CanRecv() bool { return c&Crecv != 0 }
func (c ChanDir) CanSend() bool { return c&Csend != 0 }

const (
	// types of channel
	// must match ../../../../reflect/type.go:/ChanDir
	Crecv ChanDir = 1 << 0
	Csend ChanDir = 1 << 1
	Cboth ChanDir = Crecv | Csend
)

// Types stores pointers to predeclared named types.
//

	typs[97] = types.NewChan(typs[2], types.Cboth)
	typs[98] = newSig(params(typs[1], typs[22]), params(typs[97]))
	typs[99] = newSig(params(typs[1], typs[15]), params(typs[97]))
	typs[100] = types.NewChan(typs[2], types.Crecv)
	typs[101] = newSig(params(typs[100], typs[3]), nil)
	typs[102] = newSig(params(typs[100], typs[3]), params(typs[6]))
	typs[103] = types.NewChan(typs[2], types.Csend)
	typs[104] = newSig(params(typs[103], typs[3]), nil)