v8/test/mjsunit/regress/regress-crbug-624747.js

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// Copyright 2016 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 --es-staging
"use strict";
function bar() {
try {
unref;
} catch (e) {
return (1 instanceof TypeError) && unref(); // Call in tail position!
}
}
function foo() {
return bar(); // Call in tail position!
}
%OptimizeFunctionOnNextCall(foo);
foo();