v8/test/mjsunit/compiler/inline-surplus-arguments.js

// 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

var x = 42;
function foo(s) { return x + s; }
function bar(s, t) { return foo(s, t, 13); }

%PrepareFunctionForOptimization(bar);
%OptimizeFunctionOnNextCall(bar);
assertEquals(42 + 12, bar(12));