text: // Copyright 2019 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
  
  // Parameters can't have parentheses (both patterns and identifiers)
  assertThrows("( ({x: 1}) ) => {};", SyntaxError);
  assertThrows("( (x) ) => {}", SyntaxError);
  assertThrows("( ({x: 1}) = y ) => {}", SyntaxError);
  assertThrows("( (x) = y ) => {}", SyntaxError);
  
  // Declarations can't have parentheses (both patterns and identifiers)
  assertThrows("let [({x: 1})] = [];", SyntaxError);
  assertThrows("let [(x)] = [];", SyntaxError);
  assertThrows("let [({x: 1}) = y] = [];", SyntaxError);
  assertThrows("let [(x) = y] = [];", SyntaxError);
  assertThrows("var [({x: 1})] = [];", SyntaxError);
  assertThrows("var [(x)] = [];", SyntaxError);
  assertThrows("var [({x: 1}) = y] = [];", SyntaxError);
  assertThrows("var [(x) = y] = [];", SyntaxError);
  
  // Patterns in can't have parentheses in assignments either
  assertThrows("[({x: 1}) = y] = [];", SyntaxError);
  
  // Parentheses are fine around identifiers in assignments though, even inside a
  // pattern
  var x;
  [(x)] = [2];
  assertEquals(x, 2);
  [(x) = 3] = [];
  assertEquals(x, 3);
  