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deps/v8/test/mjsunit/es6/array-concat-spreadable-function.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.
+
+"use strict";
+var fn = function(a, b, c) {}
+// Functions are not concat-spreadable by default
+assertEquals([fn], [].concat(fn));
+
+// Functions may be individually concat-spreadable
+fn[Symbol.isConcatSpreadable] = true;
+fn[0] = 1, fn[1] = 2, fn[2] = 3;
+assertEquals([1, 2, 3], [].concat(fn));
+
+Function.prototype[Symbol.isConcatSpreadable] = true;
+// Functions may be concat-spreadable
+assertEquals(new Array(3), [].concat(function(a,b,c) {}));
+Function.prototype[0] = 1;
+Function.prototype[1] = 2;
+Function.prototype[2] = 3;
+assertEquals([1,2,3], [].concat(function(a, b, c) {}));