v8/test/mjsunit/regress/regress-368243.js

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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --allow-natives-syntax
function foo(a, c){
for(var f in c) {
if ("object" === typeof c[f]) {
a[f] = c[f];
foo(a[f], c[f]);
}
}
};
c = {
"one" : { x : 1},
"two" : { x : 2},
"thr" : { x : 3, z : 4},
};
foo({}, c);
foo({}, c);
%OptimizeFunctionOnNextCall(foo);
foo({}, c);