text: // Copyright 2017 the V8 project authors.  All rights reserved.
  // This code is governed by the BSD license found in the LICENSE file.
  
  /*---
  info: |
      RegExpInitialize ( obj, pattern, flags )
        5. If F contains any code unit other than "g", "i", "m", "s", "u", or "y" or if it contains the same code unit more than once, throw a SyntaxError exception.
  esid: sec-regexpinitialize
  description: Check that duplicate RegExp flags are disallowed
  features: [regexp-dotall]
  ---*/
  
  new RegExp("", "mig"); // single g will not throw SyntaxError
  assert.throws(SyntaxError, () => new RegExp("", "migg"), "duplicate g");
  
  new RegExp("", "i"); // single i will not throw SyntaxError
  assert.throws(SyntaxError, () => new RegExp("", "ii"), "duplicate i");
  
  new RegExp("", "m"); // single m will not throw SyntaxError
  assert.throws(SyntaxError, () => new RegExp("", "mm"), "duplicate m");
  
  new RegExp("", "s"); // single s will not throw SyntaxError
  assert.throws(SyntaxError, () => new RegExp("", "ss"), "duplicate s");
  
  new RegExp("", "u"); // single u will not throw SyntaxError
  assert.throws(SyntaxError, () => new RegExp("", "uu"), "duplicate u");
  
  new RegExp("", "y"); // single y will not throw SyntaxError
  assert.throws(SyntaxError, () => new RegExp("", "yy"), "duplicate y");
  