// or (now, with the error caught earlier)
//    Treating auto as if it were arg, func (*Html).xyzzy, node ...
// caused by racewalker inserting instrumentation before an OAS where the Ninit
// of the OAS defines part of its right-hand-side. (I.e., the race instrumentation
// references a variable before it is defined.)
func (options *Html) xyzzy(id string) string {

			n := n.(*ir.Name)
			base.Errorf("%v is not a top level statement", n.Sym())
		} else {
			base.Errorf("%v is not a top level statement", n.Op())
		}
		ir.Dump("nottop", n)
		return n

	case ir.OAS,
		ir.OASOP,
		ir.OAS2,
		ir.OAS2DOTTYPE,
		ir.OAS2RECV,
		ir.OAS2FUNC,
		ir.OAS2MAPR,
		ir.OCLEAR,
		ir.OCLOSE,
		ir.OCOPY,
		ir.OCALLINTER,
		ir.OCALL,
		ir.OCALLFUNC,
		ir.ODELETE,

	return ir.InitExpr(init, call)
}

func convas(n *ir.AssignStmt, init *ir.Nodes) *ir.AssignStmt {
	if n.Op() != ir.OAS {
		base.Fatalf("convas: not OAS %v", n.Op())
	}
	n.SetTypecheck(1)

	if n.X == nil || n.Y == nil {
		return n
	}

	lt := n.X.Type()
	rt := n.Y.Type()
	if lt == nil || rt == nil {
		return n
	}

	"cmd/compile/internal/typecheck"
	"cmd/compile/internal/types"
	"cmd/internal/src"
)

// walkAssign walks an OAS (AssignExpr) or OASOP (AssignOpExpr) node.
func walkAssign(init *ir.Nodes, n ir.Node) ir.Node {
	init.Append(ir.TakeInit(n)...)

	var left, right ir.Node
	switch n.Op() {
	case ir.OAS:
		n := n.(*ir.AssignStmt)
		left, right = n.X, n.Y
	case ir.OASOP:
		n := n.(*ir.AssignOpStmt)
		left, right = n.X, n.Y

func (s *Schedule) tryStaticInit(n ir.Node) bool {
	var lhs []ir.Node
	var rhs ir.Node

	switch n.Op() {
	default:
		base.FatalfAt(n.Pos(), "unexpected initialization statement: %v", n)
	case ir.OAS:
		n := n.(*ir.AssignStmt)
		lhs, rhs = []ir.Node{n.X}, n.Y
	case ir.OAS2DOTTYPE, ir.OAS2FUNC, ir.OAS2MAPR, ir.OAS2RECV:
		n := n.(*ir.AssignListStmt)
		if len(n.Lhs) < 2 || len(n.Rhs) != 1 {

	case ir.ORECOVERFP:
		return walkRecoverFP(n.(*ir.CallExpr), init)

	case ir.OCFUNC:
		return n

	case ir.OCALLINTER, ir.OCALLFUNC:
		n := n.(*ir.CallExpr)
		return walkCall(n, init)

	case ir.OAS, ir.OASOP:
		return walkAssign(init, n)

	case ir.OAS2:
		n := n.(*ir.AssignListStmt)
		return walkAssignList(init, n)

	// a,b,... = fn()
	case ir.OAS2FUNC:
		n := n.(*ir.AssignListStmt)

var OpNames = []string{
	OADDR:             "&",
	OADD:              "+",
	OADDSTR:           "+",
	OANDAND:           "&&",
	OANDNOT:           "&^",
	OAND:              "&",
	OAPPEND:           "append",
	OAS:               "=",
	OAS2:              "=",
	OBREAK:            "break",
	OCALL:             "function call", // not actual syntax
	OCAP:              "cap",
	OCASE:             "case",
	OCLEAR:            "clear",

//
//	m = OMAKESLICECOPY([]T, x, s); nil
func orderMakeSliceCopy(s []ir.Node) {
	if base.Flag.N != 0 || base.Flag.Cfg.Instrumenting {
		return
	}
	if len(s) < 2 || s[0] == nil || s[0].Op() != ir.OAS || s[1] == nil || s[1].Op() != ir.OCOPY {
		return
	}

	as := s[0].(*ir.AssignStmt)
	cp := s[1].(*ir.BinaryExpr)
	if as.Y == nil || as.Y.Op() != ir.OMAKESLICE || ir.IsBlank(as.X) ||

	}

	if v1 == nil || v2 != nil {
		return nil
	}

	if len(loop.Body) != 1 || loop.Body[0] == nil {
		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() {

					// on the same line). This matches the approach before 1.10.
					pos = ncase.Pos()
				}
				base.ErrorfAt(pos, errors.InvalidSelectCase, "select case must be receive, send or assign recv")

			case ir.OAS:
				// convert x = <-c into x, _ = <-c
				// remove implicit conversions; the eventual assignment
				// will reintroduce them.
				n := n.(*ir.AssignStmt)