case types.ASTRING:
		return mapfaststr
	}
	return mapslow
}

func walkAppendArgs(n *ir.CallExpr, init *ir.Nodes) {
	walkExprListSafe(n.Args, init)

	// walkExprListSafe will leave OINDEX (s[n]) alone if both s
	// and n are name or literal, but those may index the slice we're
	// modifying here. Fix explicitly.
	ls := n.Args
	for i1, n1 := range ls {
		ls[i1] = cheapExpr(n1, init)
	}
}

		rhs := ir.NewIndexExpr(base.Pos, vstate, i)
		rhs.SetBounded(true)

		kidx := ir.NewIndexExpr(base.Pos, vstatk, i)
		kidx.SetBounded(true)

		// typechecker rewrites OINDEX to OINDEXMAP
		lhs := typecheck.AssignExpr(ir.NewIndexExpr(base.Pos, m, kidx)).(*ir.IndexExpr)
		base.AssertfAt(lhs.Op() == ir.OINDEXMAP, lhs.Pos(), "want OINDEXMAP, have %+v", lhs)
		lhs.RType = n.RType

	case ir.OSLICE2ARRPTR:
		n := n.(*ir.ConvExpr)
		n.X = walkExpr(n.X, init)
		return n

	case ir.ODIV, ir.OMOD:
		n := n.(*ir.BinaryExpr)
		return walkDivMod(n, init)

	case ir.OINDEX:
		n := n.(*ir.IndexExpr)
		return walkIndex(n, init)

	case ir.OINDEXMAP:
		n := n.(*ir.IndexExpr)
		return walkIndexMap(n, init)

	case ir.ORECV:

	OSTRUCTLIT:        8,
	OTYPE:             8,
	OUNSAFEADD:        8,
	OUNSAFESLICE:      8,
	OUNSAFESLICEDATA:  8,
	OUNSAFESTRING:     8,
	OUNSAFESTRINGDATA: 8,
	OINDEXMAP:         8,
	OINDEX:            8,
	OSLICE:            8,
	OSLICESTR:         8,
	OSLICEARR:         8,
	OSLICE3:           8,
	OSLICE3ARR:        8,
	OSLICEHEADER:      8,
	OSTRINGHEADER:     8,
	ODOTINTER:         8,

	case ir.OXDOT, ir.ODOT:
		n := n.(*ir.SelectorExpr)
		return tcDot(n, top)

	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)

				instanceType, object, oindex, partNumber, rec.Code, string(bd), err1)
		}

		oinfo, err := obj.GetObjectInfo(context.Background(), bucketName, object, ObjectOptions{})
		if err != nil {
			t.Fatalf("Object: %s Object Index %d: Unexpected err: %v", object, oindex, err)
		}

		rs := partNumberToRangeSpec(oinfo, partNumber)
		size, err := oinfo.GetActualSize()

		return nil
	}

	stmt1 := loop.Body[0] // only stmt in body
	if stmt1.Op() != ir.OAS {
		return nil
	}
	stmt := stmt1.(*ir.AssignStmt)
	if stmt.X.Op() != ir.OINDEX {
		return nil
	}
	lhs := stmt.X.(*ir.IndexExpr)
	x := lhs.X
	if a.Type().IsPtr() && a.Type().Elem().IsArray() {
		if s, ok := x.(*ir.StarExpr); ok && s.Op() == ir.ODEREF {
			x = s.X
		}
	}

					continue
				}
			}
			break
		}

		var name *ir.Name
		switch l.Op() {
		default:
			base.Fatalf("unexpected lvalue %v", l.Op())
		case ir.ONAME:
			name = l.(*ir.Name)
		case ir.OINDEX, ir.OINDEXMAP:
			l := l.(*ir.IndexExpr)
			save(&l.X)
			save(&l.Index)
		case ir.ODEREF:
			l := l.(*ir.StarExpr)
			save(&l.X)
		case ir.ODOTPTR:
			l := l.(*ir.SelectorExpr)
			save(&l.X)
		}

		n.SetType(nil)
		return n
	}
	if !t.IsInterface() {
		base.Fatalf("OITAB of %v", t)
	}
	n.SetType(types.NewPtr(types.Types[types.TUINTPTR]))
	return n
}

// tcIndex typechecks an OINDEX node.
func tcIndex(n *ir.IndexExpr) ir.Node {
	n.X = Expr(n.X)
	n.X = DefaultLit(n.X, nil)
	n.X = implicitstar(n.X)
	l := n.X
	n.Index = Expr(n.Index)
	r := n.Index
	t := l.Type()

		return StaticLoc(n.FuncName())

	case ir.ODOT:
		n := n.(*ir.SelectorExpr)
		if name, offset, ok = StaticLoc(n.X); !ok {
			break
		}
		offset += n.Offset()
		return name, offset, true

	case ir.OINDEX:
		n := n.(*ir.IndexExpr)
		if n.X.Type().IsSlice() {
			break
		}
		if name, offset, ok = StaticLoc(n.X); !ok {
			break
		}
		l := getlit(n.Index)
		if l < 0 {
			break
		}