switch width {
		case 1, 2, 4, 8:
			return true
		}
	}
	return false
}

// walkRange transforms various forms of ORANGE into
// simpler forms.  The result must be assigned back to n.
// Node n may also be modified in place, and may also be
// the returned node.
func walkRange(nrange *ir.RangeStmt) ir.Node {
	base.Assert(!nrange.DistinctVars) // Should all be rewritten before escape analysis

		n := n.(*ir.SelectStmt)
		walkSelect(n)
		return n

	case ir.OSWITCH:
		n := n.(*ir.SwitchStmt)
		walkSwitch(n)
		return n

	case ir.ORANGE:
		n := n.(*ir.RangeStmt)
		return walkRange(n)
	}

	// No return! Each case must return (or panic),
	// to avoid confusion about what gets returned
	// in the presence of type assertions.
}

func walkStmtList(s []ir.Node) {
	for i := range s {

	case *parse.IfNode:
		s.walkIfOrWith(parse.NodeIf, dot, node.Pipe, node.List, node.ElseList)
	case *parse.ListNode:
		for _, node := range node.Nodes {
			s.walk(dot, node)
		}
	case *parse.RangeNode:
		s.walkRange(dot, node)
	case *parse.TemplateNode:
		s.walkTemplate(dot, node)
	case *parse.TextNode:
		if _, err := s.wr.Write(node.Text); err != nil {
			s.writeError(err)
		}
	case *parse.WithNode: