// We still need to use cmpl and cmpr, in case they contain
		// an expression which might panic. See issue 23837.
		a1 := typecheck.Stmt(ir.NewAssignStmt(base.Pos, ir.BlankNode, cmpl))
		a2 := typecheck.Stmt(ir.NewAssignStmt(base.Pos, ir.BlankNode, cmpr))
		init.Append(a1, a2)
	}
	return finishCompare(n, expr, init)
}

func walkCompareInterface(n *ir.BinaryExpr, init *ir.Nodes) ir.Node {

		// use conv to ensure r is assignable to l (#13263).
		dst := ir.Node(l)
		if loff != 0 || !types.Identical(typ, l.Type()) {
			dst = ir.NewNameOffsetExpr(base.Pos, l, loff, typ)
		}
		s.append(ir.NewAssignStmt(base.Pos, dst, typecheck.Conv(r, typ)))
		return true

	case ir.ONIL:
		return true

	case ir.OLITERAL:
		if ir.IsZero(r) {
			return true
		}

		// expr
		pos := p.pos()
		switch p.tok {
		case _AssignOp:
			// lhs op= rhs
			op := p.op
			p.next()
			return p.newAssignStmt(pos, op, lhs, p.expr())

		case _IncOp:
			// lhs++ or lhs--
			op := p.op
			p.next()
			return p.newAssignStmt(pos, op, lhs, nil)

		case _Arrow:
			// lhs <- rhs
			s := new(SendStmt)
			s.pos = pos
			p.next()
			s.Chan = lhs

	}
	return cheapExpr(n, init)
}

func copyExpr(n ir.Node, t *types.Type, init *ir.Nodes) ir.Node {
	l := typecheck.TempAt(base.Pos, ir.CurFunc, t)
	appendWalkStmt(init, ir.NewAssignStmt(base.Pos, l, n))
	return l
}

func walkAddString(n *ir.AddStringExpr, init *ir.Nodes) ir.Node {
	c := len(n.List)

	if c < 2 {
		base.Fatalf("walkAddString count %d too small", c)
	}

	if !ir.Any(*np, func(n ir.Node) bool { return n.Op() != ir.ONEW && callOrChan(n) }) {
		return
	}

	tmp := TempAt(base.Pos, ir.CurFunc, (*np).Type())
	as := ir.NewAssignStmt(base.Pos, tmp, *np)
	as.PtrInit().Append(Stmt(ir.NewDecl(n.Pos(), ir.ODCL, tmp)))
	*np = tmp

	n.PtrInit().Append(Stmt(as))
}

// RewriteMultiValueCall rewrites multi-valued f() to use temporaries,

					base.Fatalf("unhandled type switch case %v", ncase.List[0])
				}
				val.SetType(caseVar.Type())
				val.SetTypecheck(1)
			}
			l := []ir.Node{
				ir.NewDecl(ncase.Pos(), ir.ODCL, caseVar),
				ir.NewAssignStmt(ncase.Pos(), caseVar, val),
			}
			typecheck.Stmts(l)
			sw.Compiled.Append(l...)
		}
		sw.Compiled.Append(ncase.Body...)
		sw.Compiled.Append(br)
	}

	walkStmtList(sw.Compiled)
	sw.Tag = nil