// bitstream.
func (r *Decoder) Value() constant.Value {
	r.Sync(SyncValue)
	isComplex := r.Bool()
	val := r.scalar()
	if isComplex {
		val = constant.BinaryOp(val, token.ADD, constant.MakeImag(r.scalar()))
	}
	return val
}

func (r *Decoder) scalar() constant.Value {
	switch tag := CodeVal(r.Code(SyncVal)); tag {
	default:
		panic(fmt.Errorf("unexpected scalar tag: %v", tag))

		val = constant.Make(&x)

	case types.IsFloat:
		val = r.mpfloat(b)

	case types.IsComplex:
		re := r.mpfloat(b)
		im := r.mpfloat(b)
		val = constant.BinaryOp(re, token.ADD, constant.MakeImag(im))

	default:
		errorf("unexpected type %v", typ) // panics
		panic("unreachable")
	}

	return
}

func intSize(b *types.Basic) (signed bool, maxBytes uint) {

				n.SetType(nil)
				return n
			}
			if !checkmake(t, "size", &l) {
				n.SetType(nil)
				return n
			}
		} else {
			l = ir.NewInt(base.Pos, 0)
		}
		nn = ir.NewMakeExpr(n.Pos(), ir.OMAKEMAP, l, nil)
		nn.SetEsc(n.Esc())

	case types.TCHAN:
		l = nil
		if i < len(args) {
			l = args[i]
			i++
			l = Expr(l)
			l = DefaultLit(l, types.Types[types.TINT])
			if l.Type() == nil {

		n := n.(*InlinedCallExpr)
		// TODO(mdempsky): Print Init and/or Body?
		if len(n.ReturnVars) == 1 {
			fmt.Fprintf(s, "%v", n.ReturnVars[0])
			return
		}
		fmt.Fprintf(s, "(.%v)", n.ReturnVars)

	case OMAKEMAP, OMAKECHAN, OMAKESLICE:
		n := n.(*MakeExpr)
		if n.Cap != nil {
			fmt.Fprintf(s, "make(%v, %v, %v)", n.Type(), n.Len, n.Cap)
			return
		}

	SYS_MOUNT                = 410 // { int|sys|50|mount(const char *type, const char *path, int flags, void *data, size_t data_len); }
	SYS_MREMAP               = 411 // { void *|sys||mremap(void *old_address, size_t old_size, void *new_address, size_t new_size, int flags); }
	SYS_PSET_CREATE          = 412 // { int|sys||pset_create(psetid_t *psid); }

	SYS_MOUNT                = 410 // { int|sys|50|mount(const char *type, const char *path, int flags, void *data, size_t data_len); }
	SYS_MREMAP               = 411 // { void *|sys||mremap(void *old_address, size_t old_size, void *new_address, size_t new_size, int flags); }
	SYS_PSET_CREATE          = 412 // { int|sys||pset_create(psetid_t *psid); }

	// TODO: add preferred region to -u-rg-.
	if e := w.Extensions(); len(e) > 0 {
		b := language.Builder{}
		b.SetTag(tt)
		for _, e := range e {
			b.AddExt(e)
		}
		tt = b.Make()
	}
	return makeTag(tt), index, c
}

// ErrMissingLikelyTagsData indicates no information was available
// to compute likely values of missing tags.
var ErrMissingLikelyTagsData = errors.New("missing likely tags data")

		return walkClear(n)

	case ir.OCLOSE:
		n := n.(*ir.UnaryExpr)
		return walkClose(n, init)

	case ir.OMAKECHAN:
		n := n.(*ir.MakeExpr)
		return walkMakeChan(n, init)

	case ir.OMAKEMAP:
		n := n.(*ir.MakeExpr)
		return walkMakeMap(n, init)

	case ir.OMAKESLICE:
		n := n.(*ir.MakeExpr)
		return walkMakeSlice(n, init)

	case ir.OMAKESLICECOPY:
		n := n.(*ir.MakeExpr)

			return
		}

		// if both arguments are constants, the result is a constant
		if x.mode == constant_ && y.mode == constant_ {
			x.val = constant.BinaryOp(constant.ToFloat(x.val), token.ADD, constant.MakeImag(constant.ToFloat(y.val)))
		} else {
			x.mode = value
		}

		if check.recordTypes() && x.mode != constant_ {
			check.recordBuiltinType(call.Fun, makeSig(resTyp, x.typ, x.typ))
		}

		x.typ = resTyp

			return
		}

		// if both arguments are constants, the result is a constant
		if x.mode == constant_ && y.mode == constant_ {
			x.val = constant.BinaryOp(constant.ToFloat(x.val), token.ADD, constant.MakeImag(constant.ToFloat(y.val)))
		} else {
			x.mode = value
		}

		if check.recordTypes() && x.mode != constant_ {
			check.recordBuiltinType(call.Fun, makeSig(resTyp, x.typ, x.typ))
		}

		x.typ = resTyp