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// |reftest| error:SyntaxError
'use strict';
// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es5id: 11.13.2-6-16-s
esid: sec-assignment-operators
description: >
    Strict Mode - SyntaxError is thrown if the identifier arguments
    appear as the LeftHandSideExpression of a Compound Assignment
    operator(-=)
flags: [onlyStrict]
negative:
  phase: parse
  type: SyntaxError
---*/

$DONOTEVALUATE();

arguments -= 20;