case ir.OAS2:
		tcAssignList(n.(*ir.AssignListStmt))
		return n

	case ir.OBREAK,
		ir.OCONTINUE,
		ir.ODCL,
		ir.OGOTO,
		ir.OFALL:
		return n

	case ir.OBLOCK:
		n := n.(*ir.BlockStmt)
		Stmts(n.List)
		return n

	case ir.OLABEL:
		if n.Sym().IsBlank() {
			// Empty identifier is valid but useless.
			// Eliminate now to simplify life later.
			// See issues 7538, 11589, 11593.

		default:
			base.Fatalf("order.stmt: %v", r.Op())
		}

		o.as2ok(n)
		o.popTemp(t)

	// Special: does not save n onto out.
	case ir.OBLOCK:
		n := n.(*ir.BlockStmt)
		o.stmtList(n.List)

	// Special: n->left is not an expression; save as is.
	case ir.OBREAK,
		ir.OCONTINUE,
		ir.ODCL,
		ir.OFALL,
		ir.OGOTO,
		ir.OLABEL,
		ir.OTAILCALL:

			u.node(node.Results)
		}
	case *ast.FieldList:
		for _, field := range node.List {
			u.node(field)
		}
	case *ast.Field:
		u.node(node.Type)

	// statements

	case *ast.BlockStmt:
		defer u.scoped()()
		for _, stmt := range node.List {
			u.node(stmt)
		}
	case *ast.DeclStmt:
		u.node(node.Decl)
	case *ast.IfStmt:
		if node.Init != nil {
			u.node(node.Init)
		}

		{"BinaryExpr", Type, 0},
		{"BinaryExpr.Op", Field, 0},
		{"BinaryExpr.OpPos", Field, 0},
		{"BinaryExpr.X", Field, 0},
		{"BinaryExpr.Y", Field, 0},
		{"BlockStmt", Type, 0},
		{"BlockStmt.Lbrace", Field, 0},
		{"BlockStmt.List", Field, 0},
		{"BlockStmt.Rbrace", Field, 0},
		{"BranchStmt", Type, 0},
		{"BranchStmt.Label", Field, 0},
		{"BranchStmt.Tok", Field, 0},
		{"BranchStmt.TokPos", Field, 0},

		for node, scope := range info.Scopes {
			var kind string
			switch node.(type) {
			case *syntax.File:
				kind = "file"
			case *syntax.FuncType:
				kind = "func"
			case *syntax.BlockStmt:
				kind = "block"
			case *syntax.IfStmt:
				kind = "if"
			case *syntax.SwitchStmt:
				kind = "switch"
			case *syntax.SelectStmt:
				kind = "select"
			case *syntax.CaseClause:

		for node, scope := range info.Scopes {
			kind := "<unknown node kind>"
			switch node.(type) {
			case *ast.File:
				kind = "file"
			case *ast.FuncType:
				kind = "func"
			case *ast.BlockStmt:
				kind = "block"
			case *ast.IfStmt:
				kind = "if"
			case *ast.SwitchStmt:
				kind = "switch"
			case *ast.TypeSwitchStmt:
				kind = "type switch"
			case *ast.CaseClause:

pkg go/ast, type BinaryExpr struct, OpPos token.Pos
pkg go/ast, type BinaryExpr struct, X Expr
pkg go/ast, type BinaryExpr struct, Y Expr
pkg go/ast, type BlockStmt struct
pkg go/ast, type BlockStmt struct, Lbrace token.Pos
pkg go/ast, type BlockStmt struct, List []Stmt
pkg go/ast, type BlockStmt struct, Rbrace token.Pos
pkg go/ast, type BranchStmt struct
pkg go/ast, type BranchStmt struct, Label *Ident

	// then this code is dead. Stop here.
	if s.curBlock == nil && n.Op() != ir.OLABEL {
		return
	}

	s.stmtList(n.Init())
	switch n.Op() {

	case ir.OBLOCK:
		n := n.(*ir.BlockStmt)
		s.stmtList(n.List)

	case ir.OFALL: // no-op

	// Expression statements
	case ir.OCALLFUNC:
		n := n.(*ir.CallExpr)
		if ir.IsIntrinsicCall(n) {
			s.intrinsicCall(n)
			return